AUSTIN, Texas (NEWSnet/AP) — A federal judge on Thursday blocked a Texas law that would give local police broad powers to arrest migrants suspected of illegally entering the U.S.

The preliminary injunction granted by U.S. District Judge David Ezra pauses a law that was set to take effect March 5 and came as President Joe Biden and his likely Republican challenger in November, Donald Trump, were visiting Texas' southern border to discuss immigration.

Texas officials are expected to appeal.

Ezra cited the Constitution’s supremacy clause and U.S. Supreme Court decisions as factors that contributed to his ruling.

He said the Texas law would conflict with federal immigration law, and the nation’s foreign relations and treaty obligations.

Ezra wrote in his decision that allowing Texas to “permanently supersede federal directives” due to an invasion would “amount to nullification of federal law and authority — a notion that is antithetical to the Constitution and has been unequivocally rejected by federal courts since the Civil War.”

The lawsuit is among several legal battles between Texas and Biden’s administration over how far the state can go to try to prevent migrants from crossing the border.

The measure would allow state law enforcement officers to arrest people suspected of entering the country illegally. Once in custody, they could agree to a Texas judge’s order to leave the country or face a misdemeanor charge for entering the U.S. illegally. Migrants who don’t leave after being ordered to do so could be arrested again and charged with a more serious felony.

At a Feb. 15 hearing, Ezra expressed skepticism as the state pleaded its case for what is known as Senate Bill 4. He also said he was somewhat sympathetic to the concerns expressed by Abbott and other state officials about the large number of illegal crossings.

Ezra, who was appointed by former President Ronald Reagan, said he feared the United States could become a confederation of states enforcing their own immigration laws.

Civil rights groups, who also sued the state, have argued the law could lead to civil rights violations and racial profiling.

Republicans who back the law have said it would not target immigrants already living in the U.S. because of the two-year statute of limitations on the illegal entry charge and would be enforced only along the state’s border with Mexico.

Tensions have remained high between Texas and the Biden administration this year over who can patrol the border and how. Other GOP governors have expressed support for Abbott, who has said the federal government is not doing enough to enforce immigration laws.

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