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Mick Mulvaney

Updated at 9:15 p.m. ET

For the fourth time in three years, President Trump has a new chief of staff.

With his administration grappling with the response to coronavirus — and just months ahead of the next election — Trump tweeted on Friday night that congressional ally Mark Meadows will be his newest top aide at the White House.

Seeking to "evaluate the independence and effectiveness" of the federal Consumer Financial Protection Bureau's student loan office, 15 members of the Senate Democratic Caucus sent a terse letter Thursday evening to Mick Mulvaney, the CFPB's acting director. The letter was first obtained by NPR.