WASHINGTON — John McEntee, who has served as President Trump’s personal assistant since Mr. Trump won the presidency, was forced out of his position and escorted from the White House on Monday after an investigation into his finances caused his security clearance to be revoked, officials with knowledge of the incident said.

But Mr. McEntee will remain in the president’s orbit despite his abrupt departure from the White House. Mr. Trump’s re-election campaign announced Tuesday that Mr. McEntee had been named senior adviser for campaign operations, putting him in a position to remain as a close aide during the next several years.

The campaign’s decision underscores Mr. Trump’s tolerance for — and often encouragement of — dueling centers of power around him. And it highlights the extent to which the re-election campaign has already become a landing pad for former Trump associates who have left the White House but remain loyal to the president.

The decision to remove Mr. McEntee came to light on the same day that Mr. Trump announced that he was removing Rex W. Tillerson as secretary of state and replacing him with Mike Pompeo, his C.I.A. director.