Attorney General Jeff Sessions on Friday ordered federal prosecutors to take a “zero tolerance policy” toward illegal immigrants nabbed at the U.S.-Mexico border, saying they should be prosecuted to the fullest extent possible.

U.S. attorneys in Arizona, New Mexico, southern California and southern and west Texas were told to prosecute every person Homeland Security officers and agents catch attempting to enter the U.S. illegally, “to the extent practicable.”

“You are on the front lines of this battle,” Mr. Sessions said in a memo to the prosecutors.

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