A federal judge says Gwynne Wilcox must remain at the agency that oversees relations among workers, labor unions and employers, setting up a Supreme Court showdown over presidential powers.

President Donald Trump’s firing of the former chairwoman of the National Labor Relations Board was an “illegal act,” a federal judge ruled Thursday, overturning her ousting in a decision that was highly critical of Trump’s “intent on pushing the bounds of his office.

A federal judge has ruled Thursday that President Donald Trump acted illegally when he fired a member of an independent labor agency, and the judge ordered that she be allowed to remain on the job.