Trump fired all three remaining members of the U.S. Election Assistance Commission on Thursday, abruptly disabling the only federal agency devoted solely to election administration at a moment when Trump has sought to reshape federal voting rules.

The two Democratic commissioners, Thomas Hicks and Benjamin Hovland, were notified by email. “On behalf of President Donald J. Trump, I am writing to inform you that your position as Commissioner of the Election Assistance Commission is terminated, effective immediately. Thank you for your service,” the email said. It was signed by Morgan DeWitt Snow, deputy director of presidential personnel in the Executive Office of the President.

The third commissioner, Republican Christy McCormick, was allowed to resign, according to three sources within the agency. McCormick declined to comment when reached by phone. The agency’s fourth commissioner, Republican Donald Palmer, voluntarily departed the agency earlier this year to join the Heritage Foundation.