F.B.I. officials briefed the top members of the Senate Armed Services Committee late Friday afternoon on the findings from their background check of Pete Hegseth, President-elect Donald J. Trump’s pick to serve as defense secretary, according to two people aware of the briefings.

The results of the F.B.I.’s probe have not been shared with the other members of the committee, raising concerns among Democrats on the panel that the findings may have gaps that would necessitate further investigation.

Senator Roger Wicker, Republican of Mississippi and the chairman of the armed services panel, and Senator Jack Reed of Rhode Island, its top Democrat, each huddled separately with F.B.I. officials on Friday for over an hour, according to a person familiar with the briefings, who spoke on condition of anonymity to discuss sensitive proceedings.

During the sessions, the senators were able to review the findings and ask questions about them, but were not given copies of a report to share with their colleagues.

With only days to go before Mr. Hegseth’s confirmation hearing on Tuesday, it appears increasingly unlikely that other senators on the panel will be shown that information before querying him about his fitness to run the Pentagon.

Rank-and-file Democrats have been up in arms about the lack of access, saying it is necessary for them to review the F.B.I.’s findings.