Donald Trump announced his first staffing choices for his administration Thursday, naming longtime Republican political operative Susie Wiles, who worked on all three of his presidential campaigns, as his White House chief of staff.

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.

President-elect Donald Trump selected veteran Florida political strategist Susie Wiles as his incoming White House chief of staff.