It's unclear who'll take over at the Pentagon and the military services when the top leaders all step down Monday as President-elect Donald Trump is sworn into office.

Former Hillary Clinton staffer Jamie Mannina’s criticism of Donald Trump was exposed in an undercover investigation.

A hidden-camera video released by journalist James O'Keefe on Wednesday shows Jamie Mannina, a Pentagon consultant, expressing strong disdain for President-elect Donald Trump. In the footage, Mannina,

Mark Milley to take over as the Chairman of the Joint Chiefs of Staff, the Acting Defense Secretary ... in military news each morning, and The Pentagon Rundown for a weekly breakdown of the ...

Pete Hegseth said he would trim the fat at the top of the Pentagon in favor of making more warfighters. Sen. Tommy Tuberville (R., Ala.), pointed out that the size of the Pentagon’s Joint Staff has increased significantly over the years.

The investigation details exasperation among key aides to Defense Secretary Lloyd Austin as he refused to disclose the extent of his medical crisis last year.

Pete Hegseth must be approved by the GOP-led Senate Armed Services Committee before he can go before the full Senate for confirmation.