Washington (CNN) - Pop star Lady Gaga will headline a rally in Portland, Maine, Monday calling on the state's two Republican senators to vote yes on taking up a defense bill that includes authorization to repeal the military's "don't ask, don't tell" policy toward gay and lesbian servicemembers.
A crucial Senate vote is scheduled for Tuesday afternoon, and supporters of the repeal say that as of now, they do not have the 60 votes needed to overcome a GOP filibuster blocking the bill. Maine Republicans Susan Collins and Olympia Snowe are publicly undecided, and could each potentially provide Democrats the votes they need to bring the issue before the Senate.
Lady Gaga's rally is being organized by Servicemembers Legal Defense Network (SLDN), a gay rights group mobilizing grassroots support to repeal the controversial policy. The organization also helped the singer set up a lengthy YouTube video posted Friday urging her fans to call their senators and ask them to support Tuesday's procedural vote.
The singer sent word of the planned rally via twitter Sunday night.