A federal judge said 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.

A federal judge ruled Wednesday that President Trump’s firing of the head of a board that resolves disputes between federal employees and the government was unlawful. U.S. District Judge Sparkle Sooknanan’s ruling in favor of Susan Grundmann,

A federal judge Thursday blocked the Trump administration from firing a member of the National Labor Relations Board—following two separate court rulings that cleared the administration to terminate workers—the latest in a string of rulings against Trump and cost-cutting czar Elon Musk.