A source with knowledge of the proceedings told ABC News that newly confirmed CIA Director John Ratcliffe, former NSA adviser Robert O'Brien and former Sen. Richard Burr, a former Senate Intelligence Committee chairman, have been making calls to senators on Gabbard's behalf. Gabbard has also talked to senators since her hearing, a source said.

The Senate Intelligence Committee will vote Tuesday on whether to advance Gabbard's nomination, the New York Times reported.

Sen. Young revealed his plan to vote for Gabbard in committee, boosting her odds of advancing to the floor and ultimately being confirmed.