Justice Samuel Alito had issued the block as the high court considered an appeal from the Biden administration, which has argued Senate Bill 4 is unconstitutional because it interferes with federal immigration laws.

In February, U.S. District Judge David Ezra in Austin blocked SB 4, saying the law “threatens the fundamental notion that the United States must regulate immigration with one voice.” Attorney General Ken Paxton’s office immediately appealed the ruling to the U.S. 5th Circuit Court of Appeals, which reversed Ezra’s ruling.

Earlier this year, a bipartisan immigration bill failed in the U.S. Senate after Trump told Republicans not to vote for it, in part so that he could campaign on the issue.

He was heavily criticized for a “zero tolerance” policy that required Border Patrol agents to separate children from their parents and using racist language to describe migrants.

Abbott signed SB 4 in December, marking Texas’ latest attempt to try to deter people from crossing the Rio Grande.

Last week, Mexican American Legal Defense and Educational Fund and the National Immigration Law Center also filed a lawsuit on behalf of La Union del Pueblo Entero, an advocacy group in the Rio Grande Valley founded by farmer rights activists César Chávez and Dolores Huerta.

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