The Supreme Court on Monday moved on to block a Texas law that would give police broad powers to arrest immigrants suspected of entering the United States illegally. Meanwhile, the legal battle over immigration authorities triggered by the law continues.

Judge Samuel Alito signed a one-page order indefinitely blocking Texas from enforcing a sweeping state immigration enforcement law that was scheduled to take effect this month. The wording of the order strongly suggests additional court action will be taken, but it’s unclear when.

The order marks Alito’s second extension of a moratorium on a bill, Senate Bill 4, that the Justice Department argued would infringe on the federal government’s immigration powers. Minutes after the court extended the 5 p.m. deadline it set for itself, there was brief confusion about the status of the measure.

Opponents called the law the most high-profile attempt by states to regulate immigration since an Arizona law more than a decade ago, parts of which were struck down by the Supreme Court.

Republican Texas Attorney General Ken Paxton’s office said the state’s law mirrors federal law and “was passed to address the ongoing crisis at the southern border that is impacting Texans.” It hurts more than anyone else.”

The Biden administration sued to overturn the measure, saying it would usurp core federal authority on immigration, harm international relations and create confusion in enforcing immigration laws. Civil rights groups argue the law could lead to civil rights violations and racial profiling.

A federal judge in Texas struck down the law in late February, but the 5th U.S. Circuit Court of Appeals quickly upheld the ruling, leading the federal government to appeal to the Supreme Court.

The Arizona law, often referred to by opponents as a “show your papers” measure, would allow police to arrest people for federal immigration violations. In 2012, a divided high court ruled that Washington’s impasse over immigration reform did not justify state intervention and struck down key parts of the law.

The battle over Texas immigration laws is one of multiple legal battles between Texas officials and the Biden administration over how much the state can patrol the U.S.-Mexico border and prevent illegal crossings.

Several Republican governors have backed Gov. Greg Abbott’s efforts, saying the federal government isn’t doing enough to enforce existing immigration laws.

The case unfolds as a record number of asylum seekers arrive in the United States and immigration becomes a central issue in the 2024 election.