“We will not confess wrongdoing when there was none,” Celia Cohen, Andrew Rohrbach and Derek Wikstrom wrote in a letter to Deputy Attorney General Todd Blanche.

The three assistant U.S. attorneys had been placed on leave after a number of prosecutors in New York and Washington refused to follow orders to end the case against Adams, a Democrat.

The resignations came the same day that Jay Clayton, former chairman of the U.S. Securities and Exchange Commission, was sworn in as the New York office’s new top prosecutor.