At least a couple large law firms are in the process of gathering signatures for an amicus brief in support of Perkins Coie’s lawsuit against the Trump administration, sources say.

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.

Legal organizations in Washington state have joined the outcry over President Donald Trump’s executive order targeting the Pacific Northwest’s largest law firm, Seattle-based Perkins Coie. The firm is headquartered at 1201 Third Avenue in Seattle and has more than 2,