Secretary of Defense Robert Gates and Admiral Mike Mullen, the chairman of the Joint Chiefs of Staff, are among the military leaders who'll testify next week before the Senate Armed Services Committee before senators vote on “Don't Ask, Don't Tell,” the 17-year-old law that bans gay and bisexual troops from serving openly, the Washington Post reported.

Committee Chairman Carl Levin (D-Michigan) has scheduled two days of hearings after the release of the Pentagon's report on repeal of the military ban. The report, which is expected to show that a majority of troops are okay serving alongside openly gay service members, will be released on November 30, a day earlier than planned.

Gates, Mullen, and the co-chairmen of the Pentagon Working Group, which drafted the report, Defense Department General Counsel Jeh Johnson and Army General Carter Ham, will appear before the committee on Thursday, December 2.

Arizona Senator John McCain, a staunch opponent of repeal, is the committee's highest-ranking Republican. McCain has already dismissed the report and has said he's following the advice of the service chiefs.

The leaders of the armed forces, along with General James E. Cartwright, the vice-chairman of the Joint Chiefs of Staff, will testify before the committee on Friday.

The addition of the service chiefs appears to be a concession to McCain, who has been fighting to keep the policy in place.

The hearings might be the first opportunity to gauge whether the report's findings will influence an upcoming Senate vote on repeal.