U.S. President Donald Trump has fired two Democratic officials at the National Labor Relations Board, a major shakeup that will bring hundreds of cases accusing companies of unlawful labor practices to a standstill and paves the way for Republican control of the agency.

His unlawful purge of the National Labor Relations Board on Monday serves all three goals at once. With these firings, Trump has paralyzed the board, asserted control over its agenda, and engineered a legal showdown over the scope of his constitutional authority.

The removal of the National Labor Relations Board’s general counsel had been expected. But the firing of a Democratic member stops it from protecting workers’ rights, for now.