President Trump moved on Tuesday to oust the leader of a new watchdog panel charged with overseeing how his administration spends trillions of taxpayer dollars in coronavirus pandemic relief, the latest step in an abruptly unfolding White House power play against semi-independent inspectors general across the government. The official, Glenn A. Fine, has been the acting inspector general for the Defense Department since before Mr. Trump took office and was set to become the chairman of a new Pandemic Response Accountability Committee to police how the government carries out the $2.2 trillion coronavirus relief bill. But Mr. Trump replaced Mr. Fine in his Pentagon job. In recent days, [Mr. Trump] fired an inspector general who reviewed the whistle-blower complaint that led to his impeachment, nominated a White House aide to another key inspector general post, declared that he would ignore certain oversight provisions in the new relief law and attacked another inspector general who criticized virus testing shortages. In removing Mr. Fine from his role overseeing pandemic spending, Mr. Trump targeted a former Justice Department inspector general who earned a reputation for aggressive independence in scrutinizing the F.B.I.'s use of surveillance and other law enforcement powers in the years after the Sept. 11, 2001, attacks. Replacing Mr. Fine ... will be Sean O'Donnell, who serves as the inspector general at the Environmental Protection Agency and will do double duty.