U.S. President-elect Donald Trump on Thursday announced that Susie Wiles, one of his two campaign managers, will be his White House chief of staff, entrusting a top position to a political operative who helped the Republican win the election.

The appointment was the first of what is expected to be a flurry of staffing announcements as Trump girds for a return to the White House on Jan. 20.

As gatekeeper to the president, the chief of staff typically wields great influence. The person manages White House staff, organizes the president¡¯s time and schedule, and maintains contact with other government departments and lawmakers.