President-elect Donald Trump has tapped senior campaign adviser Susie Wiles as White House chief of staff, selecting one of his most trusted political confidants for the job.

After helping engineer Donald Trump’s improbable and sweeping victory in the presidential race, Susie Wiles, the president-elect’s unassuming co-campaign chief, is seen as the frontrunner to become his White House chief of staff, according to six sources familiar with discussions inside the campaign.