If the current healthcare compromise doesn't bend the cost curve and bring down the deficit, it's "back to the drawing board," Sen. Claire McCaskill (D-Mo.) said today.

McCaskill said her vote will be determined by the Congressional Budget Office analysis of Harry Reid's new healthcare bill.

"Until we get the numbers back from the Congressional Budget Office we're all on hold," McCaskill told Fox News Sunday. "I have to be assured that this is going to bring down the deficit and is going to bring down healthcare costs for Missouri families."

Though not released yet, Reid's compromise would reportedly replace the public option with a Medicare "buy-in" for those aged 55-64 and a series of non-profit plans negotiated by the government.