President-elect Joe Biden’s core White House team is starting to take shape despite President Trump’s refusal to concede the race, stymieing a smooth transition process.

The Democrat is expected to name campaign manager Jen O’Malley Dillon as his White House deputy chief of staff, NBC first reported. Dillon will work closely with incoming chief of staff Ron Klain, a longtime adviser who served Biden in the same capacity at the start of Biden’s vice presidency.