The White House is encouraging Senate Majority Leader Harry Reid (D-Nev.) to cut a deal with Sen. Joe Lieberman (I-Conn.), which would mean eliminating the proposed Medicare expansion in the health reform bill, according to an official close to the negotiations.

But Reid is described as so frustrated with Lieberman that he is not ready to sacrifice a key element of the health care bill, and first wants to see the Congressional Budget Office cost analysis of the Medicare buy-in. The analysis is expected early this week.

"There is a weariness and a lot of frustration that one person is holding up the will of 59 others," the official said. “There is still too much anger and confusion at one particular senator’s reversal.”

The White House disputed this account, saying any notion that officials there are trying to push Reid into cutting a deal with Lieberman is inaccurate. White House officials say they are on the same page with Reid, working with him to find the best way to move forward with reform – not pushing him to do something he doesn’t want to do.

“The report is inaccurate,” said Dan Pfeiffer, White House communications director. “The White House is not pushing Senator Reid in any direction. We are working hand-in-hand with the Senate leadership to work through the various issues and pass health reform as soon as possible.”

But the source reaffirmed the account, saying that the White House recommended that Reid cut a deal with Lieberman that would allow the health reform bill to pass by Christmas, and that Reid wanted more time before making a final decision.

Also, Senate Majority Whip Dick Durbin told POLITICO, “The White House is encouraging us to find 60 votes and to preserve some of the most important parts of the bill.”

He added: “I don’t want to go into the specifics – we want Sen. Lieberman’s support.”

Lieberman threw health care reform into doubt Sunday when he told Reid that he would filibuster the bill if it allowed Americans ages 55 to 64 to purchase coverage in Medicare. His comments on CBS’s “Face the Nation” set off a series of private meetings Sunday between the Senate leadership and top White House aides, including Chief of Staff Rahm Emanuel, who encouraged Reid to cut the deal with Lieberman, the official said. The White House declined to comment.

Reid has called a special Democratic caucus meeting for 5:30 p.m. Monday.