Federal Judge in Texas Blocks President Obama's Executive Action on Immigration

Obama's order would protect millions here illegally from being deported.

U.S. District Judge Andrew Hanen’s decision comes after a hearing in Brownsville, Texas, in January and puts on hold Obama’s order, which could protect millions of immigrants who are here illegally from being deported.

Hanen wrote in a memorandum accompanying his ruling that the lawsuit should go forward and that without a preliminary injunction the states will "suffer irreparable harm in this case."

"The genie would be impossible to put back into the bottle," he wrote, adding that he agreed with the plaintiffs' argument that legalizing the presence of millions of people is a "virtually irreversible" action.

The ruling will remain in place until a trial before the 5th U.S. Circuit Court of Appeals in New Orleans.

Cesar Vargas and Erika Andiola, co-directors of the Dream Action Coalition, a political and lobbying voice in immigration issues, also issued a statement saying they weren’t surprised by the judge’s decision.

The first of Obama’s orders protecting young undocumented immigrants was set to start taking effect Wednesday.

The Associated Press contributed to this report.