“I am going to vote no on the budget because I have deep and abiding concerns about the approach on Medicare, which is essentially to privatize it,” Snowe told the Portland Press Herald.

Snowe joins her fellow Maine Sen. Susan Collins (R) and Massachusetts Sen. Scott Brown (R), all centrists who have both said they will oppose the budget. Like Snowe, Brown faces reelection in 2012.

Senate Majority Leader Harry Reid (D-Nev.) is expected to hold a vote soon, possibly this week, on the plan. The plan is expected to fail, but Reid has said it could elucidate divisions within the Republican Party.