Leaders at these agencies are filling open positions with transfers and outside hires and are making internal promotions before Trump takes office Jan. 20, according to internal documents and interviews.

The hiring could increase tensions between the Trump transition team and the Obama administration — a relationship that has grown worse in recent days due to disagreements over how the United States should handle its relationship with Israel and the issuance of new sanctions against Russia over its role in hacking incidents tied to the election.

Sean Spicer, the incoming White House press secretary, said in an interview late Friday that an agreement was struck in November that no new hires would be made after Dec. 1.

"After the election, the current administration notified us there would be a hiring freeze as of Dec. 1," he said. "The understanding was that there would be a full accounting of anyone put on the payroll after then."