WASHINGTON — The Trump administration fired most of the board of the U.S. Institute of Peace and sent its new leader into the Washington headquarters of the independent organization on Monday, in its latest effort targeting agencies tied to foreign assistance work.The remaining three members of the group’s board — Defense Secretary Pete Hegseth, Secretary of State Marco Rubio and National Defense University President Peter Garvin — fired President and CEO George Moose on Friday, according to a document obtained by The Associated Press.SNIPCurrent USIP employees said staffers from Elon Musk’s Department of Government Efficiency entered the building despite protests...