At the Pentagon, they’re privately calling the former Marine officer and fighter pilot who’s supposed to keep his eye on Defense Secretary Jim Mattis “the commissar,” according to a high-ranking defense official with knowledge of the situation. It’s a reference to Soviet-era Communist Party officials who were assigned to military units to ensure their commanders remained loyal.

Most members of President Trump’s Cabinet do not yet have leadership teams in place or even nominees for top deputies. But they do have an influential coterie of senior aides installed by the White House who are charged — above all — with monitoring the secretaries’ loyalty, according to eight officials in and outside the administration.

This shadow government of political appointees with the title of senior White House adviser is embedded at every Cabinet agency, with offices in or just outside the secretary’s suite. The White House has installed at least 16 of the advisers at departments including Energy and Health and Human Services and at some smaller agencies such as NASA, according to records first obtained by ProPublica through a Freedom of Information Act request.

These aides report not to the secretary, but to the Office of Cabinet Affairs, which is overseen by Rick Dearborn, a White House deputy chief of staff, according to administration officials. A top Dearborn aide, John Mashburn, leads a weekly conference call with the advisers, who are in constant contact with the White House.