Lady Gaga is stepping up her role as an activist in the fight to repeal Don't Ask, Don't Tell, the military policy that bans gay men and women from serving openly in the nation's armed forces.

On Monday, Gaga will headline a rally in Portland, Maine, calling on the state's two Republican senators -- Susan Collins and Olympia Snowe -- to vote to take up a defense appropriations bill that includes authorization to repeal the policy. Gaga announced the event to her 6.3 million followers over Twitter.

The pop star has recently been speaking out against the policy and urging her fans to take action, as Senate Democrats attempt to block a Republican filibuster of the bill, according to CNN.