Yes, immigration laws can be changed, and they change constantly through four separate channels: Congress passing or amending statutes, the President directing enforcement and entry decisions, federal agencies issuing regulations, and courts interpreting what existing law means. The Constitution assigns the primary authority to Congress, but in practice, each of the other three can reshape how immigration works on the ground without a single new law being enacted. That is why policy can swing sharply from one administration to the next while the statutes themselves stay largely untouched.
How Congress Changes Immigration Law
Article I, Section 8 of the Constitution gives Congress the power to establish a “uniform Rule of Naturalization,” and courts have read that power expansively since the late 1800s.1Cornell Law Institute. Article I, Section 8, Clause 4 – Overview of Naturalization Clause Congress can create new visa categories, eliminate old ones, raise or lower the annual number of green cards, or rewrite the grounds for deportation.2Office of the Law Revision Counsel. 8 USC 1153 – Allocation of Immigrant Visas
Most of the statutory framework sits in Title 8 of the United States Code, built around the Immigration and Nationality Act of 1952 and amended hundreds of times since.3Office of the Law Revision Counsel. 8 USC Ch. 12 – Immigration and Nationality Changing any of it follows the standard legislative path: a bill is introduced, a committee holds hearings and marks it up, both chambers vote, and the President signs or vetoes.
The 60-Vote Barrier That Blocks Most Reform
This is where most ambitious immigration bills die. Senate rules allow a filibuster on any immigration measure unrelated to the federal budget, so the bill effectively needs 60 votes to reach a final vote rather than a simple majority of 51.4U.S. Senate. About Filibusters and Cloture The DREAM Act passed the House in 2010 and drew 55 Senate votes in favor, five short of the threshold. The 2013 “Gang of Eight” comprehensive reform bill cleared the Senate with 68 votes but was never brought up for a vote in the House. The filibuster is the single biggest reason major immigration reform has stalled for decades.
Budget Reconciliation as a Workaround
Budget reconciliation lets certain bills pass the Senate with 51 votes, bypassing the filibuster. The catch is strict: only provisions that directly change federal spending or tax revenue qualify. The Senate’s Byrd rule allows the parliamentarian to strike anything “extraneous” to the budget, including policy changes whose budgetary impact is only incidental. Immigration provisions sometimes ride along in reconciliation bills, but they can be removed if they look more like policy than fiscal measures.
Spending Bills as a Second Legislative Lever
Even without passing standalone immigration bills, Congress shapes policy through annual appropriations. Enforcement agencies depend on those budgets, and the funding levels effectively cap what the agencies can do. Detention funding sets how many people can be held in immigration custody. Border infrastructure funding determines what gets built. The number of immigration judges, border agents, and asylum officers all hinge on what Congress chooses to fund. Appropriations bills also carry policy riders that direct or restrict how agencies spend money, and in fiscal year 2024 Congress approved $160 million specifically for reducing the USCIS application backlog. These choices do not technically change the statute, but they decide what the statute looks like in practice.
How the President Changes Immigration Policy
The President can reshape immigration without any new legislation. The most direct tool is a presidential proclamation under Section 212(f) of the Immigration and Nationality Act, which lets the President suspend entry of any group of foreign nationals whose arrival would be “detrimental to the interests of the United States.”5Office of the Law Revision Counsel. 8 USC 1182 – Inadmissible Aliens The language is intentionally broad, and courts have given presidents wide latitude to decide what counts as detrimental. The provision has been used to impose travel bans, restrict entry from specific countries, and pause programs during emergencies.
Enforcement Priorities
Every administration inherits the same statutes but can enforce them very differently. The government lacks the resources to pursue every deportation case at once, so the executive branch sets priorities that steer officers toward certain groups. These priorities are established through internal policy memos rather than formal regulations, so they can shift overnight when a new president takes office. One administration might focus almost exclusively on people with serious criminal convictions; the next might direct officers to pursue anyone without authorization regardless of criminal history. Prosecutorial discretion is a legitimate feature of the enforcement system, not a loophole, and a single memo can redirect thousands of officers.
Humanitarian Parole
The executive branch can also grant temporary entry through humanitarian parole, which allows people into the country on a case-by-case basis for urgent humanitarian reasons or significant public benefit.6eCFR. 8 CFR 212.5 – Parole of Aliens Into the United States Federal regulations identify specific groups generally eligible, including people with serious medical conditions, pregnant women, unaccompanied minors, and individuals needed as witnesses in legal proceedings. Parole does not grant permanent legal status, and the government can require bonds or periodic check-ins. Different administrations have used the authority to create large-scale programs for specific nationalities or to limit it to narrow individual cases.
How Federal Agencies Change Immigration Rules
Congress writes immigration law in broad strokes. Federal agencies fill in the operational details through regulations that carry the force of law. The Department of Homeland Security, USCIS, and other immigration agencies follow the Administrative Procedure Act when creating these rules.7Office of the Law Revision Counsel. 5 USC 551 – Definitions
The process starts with a Notice of Proposed Rulemaking in the Federal Register laying out the proposed change and the agency’s reasoning. A public comment period follows, typically 30 to 60 days, during which anyone can submit feedback.8Federal Register. A Guide to the Rulemaking Process The agency must review every substantive comment and explain its reasoning before issuing a final rule. Skipping that step can get the entire regulation thrown out in court.
What Rulemaking Actually Decides
Agency regulations determine the forms you file, the fees you pay, the evidence you submit, and the processing timelines you wait through. When USCIS updated its fee schedule in 2024, the cost of filing a naturalization application (Form N-400) went from $725 to $760 for paper filing, with a $710 online option.9USCIS. Fact Sheet – Form N-400, Application for Naturalization Filing Fees Premium processing fees have also been adjusted through rulemaking; as of March 2026, premium processing for an I-140 immigrant worker petition costs $2,965.10Federal Register. Adjustment to Premium Processing Fees
Rulemaking also defines key concepts that decide eligibility. The “public charge” ground of inadmissibility has been redefined through regulation multiple times, with each version changing who could be denied a green card based on their likely reliance on government benefits. The underlying statute never changed. The regulation decided what it meant.
The 60-Day Delay for Major Rules
Not every regulation takes effect immediately. Under the Congressional Review Act, agencies must submit new rules to Congress before enforcing them. Rules classified as “major” cannot take effect until 60 days after Congress receives them or 60 days after Federal Register publication, whichever is later.11Office of the Law Revision Counsel. 5 USC 801 – Congressional Review Congress can pass a joint resolution of disapproval to block the rule entirely with a simple majority in both chambers, though the President can veto, which puts the real threshold at two-thirds of each chamber. The CRA is most consequential during presidential transitions, when a new administration can work with Congress to undo rules finalized at the end of the prior administration.
How Courts Change What Immigration Law Means
Federal courts do not write immigration laws, but their rulings reshape what those laws mean. When a policy is challenged, judges examine whether it violates the Constitution, exceeds the authority Congress granted, or was adopted without following proper procedures. A single federal district court ruling can freeze a major policy while the case moves through appeals.
The Shrinking Role of Nationwide Injunctions
For years, individual district judges have issued “universal injunctions” blocking the government from enforcing a policy against anyone in the country, not just the plaintiffs. During the first 100 days of the second Trump administration alone, district courts issued roughly 25 such orders. In June 2025, the Supreme Court signaled that this practice likely exceeds the authority Congress gave federal courts, reasoning that traditional equitable relief protects the parties in the case rather than the entire country.12Supreme Court of the United States. Trump v. CASA, Inc. That ruling is already changing how immigration policies are challenged and may limit a single judge’s ability to halt enforcement nationwide.
Supreme Court and Appellate Interpretations
The Supreme Court has the final word on what immigration statutes mean, and its rulings bind every lower court and every federal agency. Many of the most consequential decisions clarify vague statutory terms. “Crime involving moral turpitude” appears in the grounds of inadmissibility at 8 U.S.C. § 1182 but is never defined in the statute itself.5Office of the Law Revision Counsel. 8 USC 1182 – Inadmissible Aliens Courts have spent decades defining its boundaries through individual cases, and each ruling can change whether a particular conviction triggers deportation for thousands of people.
Courts also police how agencies implement the law. If a regulation was adopted without a reasoned explanation, or if an agency reversed course without acknowledging the change, a court can strike the rule as “arbitrary and capricious” under the Administrative Procedure Act and force the agency to start over. That standard has driven major immigration litigation, including challenges to public charge changes and the rescission of deferred action programs.
The Board of Immigration Appeals
Before most immigration cases reach federal court, they pass through the Board of Immigration Appeals, which reviews decisions by immigration judges. Published BIA decisions create binding precedent for all immigration courts nationwide, shaping how asylum claims, cancellation of removal applications, and other matters are decided.13Office of the Law Revision Counsel. 8 USC 1229b – Cancellation of Removal; Adjustment of Status One procedural trap catches people often: federal law requires you to exhaust administrative remedies before a federal circuit court will hear a challenge to a removal order, which means appealing through the BIA first.14Office of the Law Revision Counsel. 8 USC 1252 – Judicial Review of Orders of Removal Failing to raise an issue before the BIA generally forfeits the right to raise it later.
What States Cannot Do
Immigration law is a federal responsibility, and state legislatures cannot override it or create their own parallel system. The Supreme Court confirmed this in its 2012 decision in Arizona v. United States, striking down most of Arizona’s state-level immigration enforcement provisions. Federal law occupies the field, and states cannot adopt their own enforcement schemes even when they mirror federal requirements. States can pass laws that touch immigration indirectly, such as E-Verify mandates for employers, rules about noncitizen access to state benefits, or “sanctuary” policies limiting cooperation with federal enforcement. But none of those decide who is admitted, who gets a visa, or who is deported. Those decisions stay federal.