Supreme Court temporarily blocks Texas immigration enforcement law

On Monday, the Supreme Court hit the brakes on a Texas law that would have given state police the power to arrest people for entering the country illegally. The emergency intervention came just hours after the Justice Department asked the high court to step in, and it came with a tight deadline: the state had until Monday to respond to the federal government's arguments.

The timing was urgent because the law, signed by Republican Governor Greg Abbott, was scheduled to take effect on Saturday. A federal appeals court had reversed a lower court's rejection of the measure over the weekend, clearing the way for it to go live unless the Supreme Court acted. The Justice Department's plea to the high court was blunt: this law would upend nearly 150 years of how immigration authority has been divided between Washington and the states. The federal government warned that allowing Texas to enforce its own immigration rules would create chaos in how federal agents do their jobs and would damage the country's relationship with Mexico.

The law itself is straightforward in its mechanics. Under Senate Bill 4, state officers could arrest anyone suspected of crossing the border illegally. Once arrested, a person could either agree to leave the country by order of a Texas judge or face a misdemeanor charge for illegal entry. If they refused to leave after being ordered to do so, they could be arrested again and charged with a felony. Republicans backing the measure said it would only apply along the Texas-Mexico border and would not target immigrants already living in the state, since the law would only prosecute illegal entry within a two-year window from the crossing.

U.S. District Judge David Ezra had rejected the law in a sweeping 114-page ruling on Thursday, finding it violated the Constitution's supremacy clause, which establishes that federal law takes precedence over state law. Ezra dismissed Republican claims about an "invasion" at the southern border—a phrase used to describe record-high illegal crossings—and said that even if Texas officials had legitimate concerns about federal immigration enforcement, those concerns did not justify the state overriding federal authority. He wrote that allowing Texas to supersede federal law based on an "invasion" would amount to nullification of federal authority, a doctrine that has been rejected by courts since the Civil War.

The federal government's case drew a parallel to a 2012 Supreme Court decision that struck down an Arizona law allowing police to arrest people for federal immigration violations. That Arizona measure, often called the "show me your papers" law, had divided the high court, but a majority found that gridlock in Washington over immigration reform did not give states the right to step in and enforce federal immigration law themselves.

Texas officials responded to the Supreme Court's intervention by arguing that their law simply mirrors federal law and was necessary because the federal government has not adequately addressed the crisis at the southern border. The state's attorney general said the law was adopted to protect Texans, who, in the state's view, bear the brunt of illegal immigration.

This legal battle is one of several between Texas and the Biden administration over how far the state can go in policing its border. Abbott has pursued an escalating series of measures in recent months, including a floating barrier in the Rio Grande—which Ezra previously blocked and remains in litigation—and razor wire strung along the state boundary with Mexico. State guard officers have also prevented U.S. Border Patrol agents from accessing a riverfront park in Eagle Pass that federal agents had used to process migrants. Several Republican governors have backed Abbott's efforts, arguing that the federal government is not enforcing existing immigration laws vigorously enough.

Texas has been arresting migrants for years under a separate program based on criminal trespass charges, but Senate Bill 4 would expand that authority significantly. The Supreme Court's temporary block now sets up the next phase of litigation, with the state's response due and the court likely to decide whether to let the law take effect or keep it blocked while the legal case proceeds.