Centrist Sen. Olympia Snowe (R-Maine) said Tuesday that she will vote against Rep. Paul RyanPaul Davis RyanHouse vote fails to quell storm surrounding Steve King House passes resolution condemning white nationalism Anti-Defamation League calls on House leaders to censure Steve King over white supremacy comments MORE's (R-Wis.) budget when it comes up for a vote in the Senate.

Snowe, who is up for reelection in 2012, praised Ryan for proposing a budget but said that she disagrees with the way it reforms Medicare.

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"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 CollinsSusan Margaret CollinsOvernight Defense: Trump faces blowback over report he discussed leaving NATO | Pentagon extends mission on border | Senate advances measure bucking Trump on Russia sanctions Senate advances measure bucking Trump on Russia sanctions Mnuchin meets with Senate GOP to shore up ranks on Russia sanctions vote MORE (R) and Massachusetts Sen. Scott Brown (R), each a centrist who has said they will oppose the budget. Like Snowe, Brown faces reelection in 2012. 

Freshman Sen. Rand PaulRandal (Rand) Howard PaulMedia fails spectacularly at smearing Rand Paul for surgery in Canada Rand Paul to have hernia surgery in Canada Ron Paul: Remove incentives for illegal immigrants instead of building border wall MORE (R-Ky.) has also said he will vote against it, but he says that's because the plan does not go far enough in cutting spending.

Senate Majority Leader Harry ReidHarry Mason ReidHarry Reid knocks Ocasio-Cortez's tax proposal: Fast 'radical change' doesn't work Overnight Defense: Trump rejects Graham call to end shutdown | Coast Guard on track to miss Tuesday paychecks | Dems eye Trump, Russia probes | Trump talks with Erdogan after making threat to Turkey's economy Harry Reid on Iraq War vote: 'It tainted my heart' MORE (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.

Democrats have seized on Ryan's Medicare plan, criticizing it as an extreme proposal that would privatize the popular, but fiscally troubled, entitlement program. Recently, they have dubbed it the GOP's "litmus test," playing up incidents in which Republicans have split with the plan.

All but four House Republicans voted for Ryan's budget.

Snowe's position is not surprising. She has not praised the Medicare reforms proposed by Ryan, the chairman of the House Budget Committee.

But she also criticized Reid for holding the vote on the Ryan budget, saying it won't foster a true budget debate.

"[Ryan] is not going to have all the answers or the answers that I am going to agree with, but the question is, can we work to improve it, to modify it? But we don't even have the opportunity in the Senate," Snowe said. "That's what we're facing, an up-or-down vote, all or nothing, and it doesn't need to be that way."