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A Latino rights groups says it has filed what may be the first lawsuit challenging a new “sanctuary cities” ban in Texas that allows local police to ask a person during routine stops whether they’re in the U.S legally.

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Luis Vera is an attorney with the League of United Latin American Citizens. He says he filed the challenge Monday on behalf of a small town near the border with Mexico called El Cenizo, which has had a “safe haven” ordinance since 1999 that prohibits city employees from asking about a person’s immigration status.

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The ACLU and other groups have also pledged to fight Texas in court over the law signed Sunday by Republican Gov. Greg Abbott. Texas has already asked a federal court to pre-emptively find that the law known as SB4 is constitutional.

Abbott says the ban is needed to keep immigrant criminals off the streets and will stand up in court.

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