WASHINGTON—A federal judge blocked most of a White House executive order punishing Perkins Coie, saying the administration had put itself at odds with the First Amendment by targeting the law firm based on President Trump’s dislike of its work for his political opponents.

A judge imposed a temporary restraining order against the Trump administration, barring it from enforcing parts of an executive order penalizing a law firm.

A federal judge has temporarily blocked President Donald Trump’s administration from enforcing portions of an executive order designed to punish a prominent law firm linked to Democratic-funded opposition research during the 2016 presidential campaign