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.

Federal labor law explicitly limits removal of board members to instances of neglect or malfeasance. The termination is among several early moves Trump has made that push at the boundaries of executive 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.

The unprecedented moves leave the agencies unable to conduct even routine business and are likely to spur legal challenges.

U.S. President Donald Trump has fired at least two Democratic members of the Equal Employment Opportunity Commission, which enforces federal laws banning workplace discrimination, in an unprecedented move likely to spur legal challenges.