Massachusetts Senator Scott Brown broke from his GOP caucus on Friday to conditionally endorse repeal of the military's ban on open gay service.

Brown's announcement came after the Senate Armed Services Committee concluded two day's worth of hearings on a Pentagon report that endorsed repeal.

“I pledged to keep an open mind about the present policy on 'Don’t Ask Don’t Tell,'” Brown said in a statement released on his website. “Having reviewed the Pentagon report, having spoken to active and retired military service members, and having discussed the matter privately with Defense Secretary Gates and others, I accept the findings of the report and support repeal based on the Secretary’s recommendations that repeal will be implemented only when the battle effectiveness of the forces is assured and proper preparations have been completed.”

Aubrey Sarvis, executive director of Servicemembers Legal Defense Network (SLDN), the largest group lobbying for repeal of the law that has ended the military careers of over 13,000 service members, said he welcomed Brown's endorsement.

“We welcome Senator Brown's comments supporting the repeal of 'Don't Ask' and the findings of the Pentagon report which showed 92% of service members are just fine working with their gay, lesbian and bisexual colleagues,” he said.

Other Republicans who say they could back repeal of the law include Senators Susan Collins and Olympia Snowe of Maine, Richard Lugar of Indiana, Lisa Murkowski of Alaska and John Ensign of Nevada. Illinois Senator Mark Kirk has said he'll study the Pentagon report before deciding. However, all 42 GOP senators have threatened to block all legislation during the lame-duck session unless Democrats agree to move on tax issues.