Supreme Court immigration cases have, over more than a century, handed Congress and the President sweeping authority over who may enter and remain in the United States, while recognizing a narrow set of constitutional protections for noncitizens already here. The rulings below are the ones that shape current immigration law: the doctrines that define federal power, the limits courts have placed on executive action, the rights noncitizens can and cannot invoke, and the procedural rules that often decide individual cases.
The Plenary Power Doctrine
Every modern immigration case sits on top of one principle. Under the plenary power doctrine, Congress holds nearly unlimited authority over immigration, and courts defer to that authority in ways they would not in almost any other area of law. The doctrine dates to the 1889 Chinese Exclusion Case, which treated control over entry as an inherent attribute of national sovereignty tied to foreign affairs and national defense.
The constitutional anchor is Article I, Section 8, which authorizes Congress to “establish an uniform Rule of Naturalization.” The Court has combined that text with the premise that any sovereign must be able to control its borders, producing a power base broad enough to sustain almost any immigration statute Congress enacts.1Legal Information Institute. U.S. Constitution Annotated Article I Section 8 Clause 4 – Overview of Naturalization Clause Courts rarely strike down immigration statutes on the merits. They do intervene when the executive branch exceeds statutory authority or when a policy runs into specific constitutional guarantees.
Presidential Authority Over Entry and Enforcement
Congress writes immigration law; the executive branch enforces it. Several landmark decisions have tested where delegated authority ends and overreach begins.
Trump v. Hawaii (2018)
The travel ban case is the Court’s clearest modern statement on the President’s power to exclude entire groups of foreign nationals. In a 5-4 decision, the majority upheld a presidential proclamation restricting entry from several countries, finding that the Immigration and Nationality Act gives the President broad discretion to suspend entry when he determines a group’s presence would be “detrimental to the interests of the United States.”2Justia U.S. Supreme Court Center. Trump v. Hawaii, 585 U.S. (2018) The Court rejected an Establishment Clause challenge, applying a deferential “facially legitimate and bona fide reason” standard to the government’s national security justification.3Constitution Annotated. Kerry v. Din and Trump v. Hawaii When the President invokes national security to restrict entry, courts are unlikely to second-guess the decision.
DHS v. Regents of the University of California (2020)
This case did not ask whether the government could end the Deferred Action for Childhood Arrivals (DACA) program. All parties agreed it could. The question was whether the way the administration went about rescinding it was lawful. In a 5-4 decision, the Court said no. The rescission was “arbitrary and capricious” under the Administrative Procedure Act because the government failed to weigh the reliance interests of the roughly 700,000 DACA recipients who had built lives around the program’s protections.4Supreme Court of the United States. Department of Homeland Security v. Regents of the University of California (2020) The ruling did not save DACA permanently. It required the government to provide an adequate explanation before unwinding the program.
Biden v. Texas (2022)
The Migrant Protection Protocols, commonly called “Remain in Mexico,” required certain asylum seekers to wait in Mexico during their immigration proceedings. When the Biden administration tried to end the policy, Texas and Missouri sued, arguing the INA required the government to either detain asylum seekers or return them to Mexico. The Court disagreed 5-4, holding that the statute’s use of “may” in describing return authority meant it was discretionary.5Supreme Court of the United States. Biden v. Texas (2022) The decision reinforced a broader theme: the executive branch retains significant discretion over how to implement enforcement, and courts are reluctant to order a President to adopt a particular policy.
United States v. Texas (2023)
Texas and Louisiana challenged federal enforcement guidelines that prioritized the arrest and removal of suspected terrorists, dangerous criminals, and recent border crossers rather than every removable noncitizen. In an 8-1 decision, the Court held that the states lacked standing to bring the challenge. Just as a private citizen cannot sue a prosecutor for declining to press charges, a state cannot sue the federal government for choosing how to allocate immigration enforcement resources.6Supreme Court of the United States. United States v. Texas (2023)
Federal Preemption of State Immigration Laws
States have repeatedly tried to fill what they see as gaps in federal enforcement, and the Court has repeatedly told them that immigration is a federal job. The controlling case is Arizona v. United States (2012), which reviewed Arizona’s SB 1070.
The Court struck down three of the law’s four challenged provisions. Making it a state crime for a noncitizen to lack federal registration documents was preempted because Congress had already created a comprehensive registration system. Making it a state crime to seek work without authorization interfered with the balance Congress struck in federal employment law. Authorizing state police to arrest noncitizens believed to be removable usurped federal discretion over the removal process.7Justia U.S. Supreme Court Center. Arizona v. United States, 567 U.S. 387 (2012) The Court did uphold a “show me your papers” provision requiring officers to check immigration status during lawful stops when they have reasonable suspicion, though it left that provision open to future challenges. The message has echoed through every subsequent dispute: where federal law occupies the field, states cannot add their own penalties, even when they believe the federal government is doing too little.
Constitutional Protections for Noncitizens
Plenary power is broad but not absolute. Two cases mark where it meets individual rights.
Plyler v. Doe (1982)
Texas passed a law allowing school districts to deny enrollment to children who were not lawfully present in the United States. The Court struck it down 5-4 under the Equal Protection Clause of the Fourteenth Amendment. The majority reasoned that denying public education to children who had no control over their immigration status imposed a “lifetime hardship” on a group that could do nothing to change its circumstances.8Justia U.S. Supreme Court Center. Plyler v. Doe, 457 U.S. 202 (1982) The decision remains one of the few areas where the Court has applied constitutional protections specifically to undocumented individuals against a state’s wishes.
Department of State v. Munoz (2024)
In a 6-3 decision, the Court held that a U.S. citizen does not have a fundamental liberty interest in her noncitizen spouse’s visa application being approved.9Supreme Court of the United States. Department of State v. Munoz (2024) The case involved a citizen whose Salvadoran husband was denied an immigrant visa, and the government refused to explain the denial beyond citing a terrorism-related inadmissibility ground. The majority found that the Constitution does not guarantee married couples a right to live together in the United States when one spouse is a noncitizen abroad. Consular officers can deny a visa with minimal explanation, and neither the applicant nor their citizen spouse has a constitutional right to judicial review of that decision.
Detention and Due Process
Noncitizens in removal proceedings can spend months or years in government custody. The Court’s detention cases draw an uneven line between the power to hold people and the limits on it.
Zadvydas v. Davis (2001)
When a noncitizen has been ordered removed but no country will accept them, the government cannot hold them indefinitely. The removal statute authorizes detention for a “period reasonably necessary” to carry out the removal, not detention without end. The Court set a presumptive six-month limit: after six months, if the noncitizen can show no realistic chance of removal in the foreseeable future, the government must either justify continued detention or release the person under supervised conditions.10Justia U.S. Supreme Court Center. Zadvydas v. Davis, 533 U.S. 678 (2001) The six-month benchmark is not automatic release. It is the point at which the burden shifts to the government to prove that removal remains likely.
Jennings v. Rodriguez (2018)
Noncitizens detained during their removal proceedings asked for periodic bond hearings every six months to challenge their continued custody. The Court rejected the claim, holding that the relevant statutes do not require automatic bond hearings at any interval. For some categories of noncitizens, the law mandates detention until proceedings conclude, with no built-in mechanism for periodic review.11Justia U.S. Supreme Court Center. Jennings v. Rodriguez, 583 U.S. (2018) The Court sent the case back for lower courts to decide the separate question of whether prolonged detention without a hearing violates due process, leaving that constitutional issue unresolved.
DHS v. Thuraissigiam (2020)
Expedited removal allows the government to deport noncitizens apprehended at or near the border without a full hearing before an immigration judge. A Sri Lankan asylum seeker challenged this process, arguing that the Suspension Clause guaranteed him access to federal court through a habeas corpus petition. The Court disagreed 7-2. The majority reasoned that habeas corpus historically served as a tool to challenge unlawful detention, not to obtain a second chance at an asylum interview. Because the applicant was not seeking release from custody but a new opportunity to apply for asylum, his claim fell outside the writ as it existed when the Constitution was adopted.12Supreme Court of the United States. Department of Homeland Security v. Thuraissigiam (2020) The decision significantly limits the ability of noncitizens in expedited removal to reach federal court.
Criminal Convictions and the Categorical Approach
A criminal conviction can trigger deportation, but the connection between a state offense and federal immigration consequences is not always straightforward. The Court uses the “categorical approach,” which looks at the legal elements of the crime as defined by the statute of conviction rather than what the person actually did.13GovInfo. Mellouli v. Lynch (2015)
Mellouli v. Lynch (2015)
Moones Mellouli, a Tunisian citizen, pleaded guilty to possessing drug paraphernalia under a Kansas statute. The government sought to deport him, arguing that any drug-related conviction triggers removal. The Court ruled 7-2 that it does not. The INA makes a noncitizen deportable for crimes “relating to a controlled substance” as defined by federal law, but the Kansas paraphernalia statute was not tied to any specific substance on the federal controlled substances schedule. Because state prosecutors never had to prove the substance was federally controlled, the conviction could not serve as the basis for deportation.13GovInfo. Mellouli v. Lynch (2015)
Esquivel-Quintana v. Sessions (2017)
The Court applied the same logic to a California statutory rape conviction. Federal immigration law treats “sexual abuse of a minor” as an aggravated felony that triggers mandatory removal. California’s statute criminalized consensual sexual contact with anyone under 18. Using the categorical approach, the Court asked whether the least serious conduct covered by the California statute would qualify as sexual abuse of a minor under federal law. It decided that in the context of age-based offenses, the federal definition requires the victim to be under 16. Since California’s law reached older minors, the conviction could not categorically be classified as an aggravated felony for immigration purposes.
Barton v. Barr (2020)
Other criminal-law rules cut the other way. A noncitizen applying for cancellation of removal must show at least seven years of continuous residence. The “stop-time” rule cuts off that accumulation when the person commits certain crimes. In Barton v. Barr, the Court held that a noncitizen who commits a qualifying offense during the initial seven years of residence is disqualified from cancellation of removal even if the conviction comes later. The offense itself, not the date of conviction, is what matters.14Supreme Court of the United States. Barton v. Barr (2020) For noncitizens with older criminal histories, the timing distinction between offense and conviction can be the difference between staying and being removed.
Procedural Rules That Decide Cases
Immigration proceedings are technical, and several recent decisions have turned on procedural details that sound minor but carry significant consequences.
Niz-Chavez v. Garland (2021)
To start removal proceedings, the government serves a “Notice to Appear.” The INA specifies what that document must include: the charges, the legal authority, the consequences of not showing up, and the time and place of the hearing. For years, the government routinely sent this information in two separate mailings, with the hearing date and location following weeks or months after the initial charges. In a 6-3 decision, the Court held that the statute requires a single document containing all the required information. Splitting the notice does not trigger the stop-time rule that cuts off a noncitizen’s accumulation of continuous residence toward cancellation of removal.15Supreme Court of the United States. Niz-Chavez v. Garland (2021) Because the government had been splitting notices in hundreds of thousands of cases, the practical impact was substantial.
Patel v. Garland (2022)
Federal law bars courts from reviewing certain discretionary immigration decisions, such as whether to grant adjustment of status. The question in Patel was whether that bar also blocks review of the factual findings behind those decisions. In a 5-4 ruling, the Court said yes. If a noncitizen applies for a green card and the immigration judge makes a factual error, federal courts cannot correct it. The jurisdictional bar covers “any judgment regarding the granting of relief,” and factual findings are part of that judgment.16Supreme Court of the United States. Patel v. Garland (2022) Getting the facts right at the immigration court level is now the only chance many applicants have.
Wilkinson v. Garland (2024)
Wilkinson pushed back on the trend of limiting review. A noncitizen seeking cancellation of removal must show that deportation would cause “exceptional and extremely unusual hardship” to a qualifying U.S. citizen or permanent resident relative. The government argued that this determination is unreviewable. The Court disagreed, holding that whether a given set of facts meets the hardship standard is a “question of law” that federal courts have jurisdiction to review.17Supreme Court of the United States. Wilkinson v. Garland (2024) Read alongside Patel, the line is this: courts cannot re-examine factual findings in discretionary relief cases, but they can review whether the legal standard was correctly applied to those facts.
The End of Chevron Deference
For decades, courts interpreting ambiguous provisions of the INA deferred to the Board of Immigration Appeals under a doctrine known as Chevron deference. If a statute was unclear and the agency’s reading was reasonable, courts accepted it. That framework ended in June 2024 when the Court overruled Chevron in Loper Bright Enterprises v. Raimondo. Courts must now exercise independent judgment when interpreting statutes, even ambiguous ones.18Supreme Court of the United States. Loper Bright Enterprises v. Raimondo (2024)
The INA is full of terms the BIA has spent decades defining through administrative decisions: “crime involving moral turpitude,” “particular social group,” “firm resettlement.” Under the old framework, courts routinely accepted the BIA’s interpretations. Now, federal judges can reach their own conclusions, even when the BIA has offered a well-reasoned alternative. The Court immediately signaled how this would play out by remanding several immigration cases for reconsideration without Chevron deference. The likely result is more inconsistency across circuits and more opportunities for noncitizens to challenge unfavorable BIA readings.
The Emergency Docket
Not every consequential immigration ruling comes through full briefing and oral argument. The Court’s emergency docket, sometimes called the “shadow docket,” has become an increasingly significant tool. In June 2025, the Court granted the government’s request for a stay in Department of Homeland Security v. D.V.D., pausing a lower court injunction that had blocked the removal of noncitizens to countries not listed on their original removal orders. The injunction had required the government to provide notice and an opportunity to raise protection claims before being sent to a different country. By staying it, the Court allowed removals to third countries to proceed without those procedural protections while the case continued on appeal.19Supreme Court of the United States. Department of Homeland Security v. D.V.D. (2025) Emergency stays like this one can reshape enforcement for months or years before the underlying legal questions receive a full hearing.