The inspectors general at agencies including the departments of state, defense and transportation were notified by emails from the White House personnel director that they had been terminated immediately, the source said on condition of anonymity.

The dismissals appeared to violate federal law, which requires the president to give both houses of Congress reasons for the dismissals 30 days in advance.

The White House did not immediately respond to a request for comment.

An inspector general is an independent position that conducts audits and investigations into allegations of waste, fraud and abuse of power.

Agencies are pressing ahead with orders from Trump, who returned to the presidency on Monday, to reshape the federal bureaucracy by scrapping diversity programs, rescinding job offers and sidelining more than 150 national security and foreign policy officials.

Friday's purge spared the Department of Justice inspector general, Michael Horowitz, according to the New York Times. The Washington Post, which was first to report the dismissals, said most were appointees from Trump's 2017-2021 first term.

Many politically appointed leaders of agencies and departments come and go with each administration, but an inspector general can serve under multiple presidents.

During his first term, Trump fired five inspectors general in less than two months in 2020. This included the State Department, whose inspector general had played a role in the president's impeachment proceedings.

Last year, Trump's predecessor Joe Biden fired the inspector general of the U.S. Railroad Retirement Board, after an investigation found the official had created a hostile work environment.

In 2022, Congress strengthened protections for inspectors general, making it harder to replace them with hand-picked officials and requiring additional explanations from a president for their removal.