The Senate's top Democrat, who has played a pivotal role in negotiating deals on the Senate bill, said in advance of the summit that Republicans should "stop crying" over the possibility that budget reconciliation could be used to pass the legislation. Reconciliation is a procedural maneuver through which the Democrats could pass portions of reform legislation with a simple 51-vote majority.
The Senate minority leader remains strongly opposed to what he and others in his party have called a Democratic-controlled "takeover" of health care. He also says a public insurance option "puts us very close to a single-payer system," though only the House bill includes such an option. McConnell, who voted against the Senate health bill last December, called Obama's health care proposal unveiled Monday a "major disappointment."
A staunch supporter of the so-called "public option," Pelosi, D-Calif., succeeded in getting a sweeping reform bill through the House last November. To finalize the legislation, Pelosi favors a plan under which Senate Democrats would use the parliamentary procedure known as "budget reconciliation" to adopt some of the measures from the House bill that differ from the Senate bill.
The House minority leader, who stands in strong opposition to "Democrats' government takeover of health care," is calling on lawmakers to "scrap" the health care bills passed in Congress and start discussions Thursday "with a clean sheet of paper." Boehner, R-Ohio, who is concerned about "job-killing taxes, fees and new layers of bureaucratic red tape," has said lowering costs should be lawmakers' top priority.
The Maryland congressman is second-ranking Democrat in the House. He is tasked with helping to usher the final legislation through the House and opposes a provision in Obama's newly unveiled health care proposal that would allow the federal government to regulate insurance-premium increases.
The House Republican whip said in a memo Wednesday that House Democratic leaders do not have enough votes to pass the Senate's version of President Obama's massive health care overhaul.
This Wisconsin Republican was tapped by Boehner to attend the summit. Ryan recently introduced legislation to give future Medicare beneficiaries vouchers to buy private health plans and also give future Social Security beneficiaries the option of investing some of their Social Security money in private accounts.
Enzi, a Wyoming Republican and the party's ranking member on the Health, Education, Labor and Pensions Committee, has said he doesn't expect Thursday's health care pow-wow to lead to a bipartisan health reform bill.
Kyl, the Republican whip in the Senate, has been skeptical of the health care summit and the Democrats' possible use of "budget reconciliation" to pass legislation. Kyl, of Arizona, told reporters recently that "it's hard for us to quite understand why, with reconciliation being planned, we're having a meeting which is allegedly designed to engender some bipartisan agreement for a way forward."
The Iowa Republican, one of the so-called "gang of six" that tried unsuccessfully to reach bipartisan agreement on the legislation, is calling on Obama and Congress to start from scratch.
The Connecticut Democrat and member of the Health, Education, Labor and Pensions Committee played a pivotal role in pushing the bill through committee during the late Sen. Edward Kennedy's battle with brain cancer. Kennedy was chairman at the time.
The New York Democrat, one of five House members representing the House in health care negotiations with the Senate, said he doesn't foresee a plan without the "public option" winning approval in the House.
The Montana Democrat and chairman of the Senate Finance Committee played a leading role in writing the sweeping health care bill that passed in the Senate, which did not include a government-run insurance option.
The Senate majority whip is spearheading health care legislative efforts in the Senate and said Tuesday he's prepared to pass legislation with zero Republican votes. Durbin, D-Ill., the number two Democrat, has said he favors "budget reconciliation" to push a bill into law and touted the Obama's proposal as a genuinely bipartisan effort.
The Michigan Republican and House Ways and Means Ranking Member has blasted Obama's health care proposal, saying it "will sink our economy and wreck the health insurance millions of Americans have and like." Camp said he hopes Democrats will "wipe the slate clean" for new reform discussions at the summit.
The Tennessee Republican and member of the House Energy and Commerce Committee has been an outspoken critic of Obama's overhaul efforts. Boehner picked Blackburn as one of several GOP "truth squad" participants to attend the summit.
A heart surgeon for more than 20 years and member of the Ways and Means Committee, Boustany has blasted Obama's overhaul for failing to provide enough benefits for families and small businesses. The Louisiana Republican, who was tapped by the GOP to provide the rebuttal to Obama's health care speech in September, is staunchly opposed to a government-run option.
This Wyoming Republican, physician and co-host of the "Senate Doctors Show," was picked by Boehner as a "truth squad" participant in Thursday's meeting.
A showdown at the O.K. Corral or an amicable meeting of opposing parties? The outcome of Thursday's health care summit remains uncertain as Washington's power players gather at Blair House to stake out their positions on health care reform -- a last-ditch effort by the Obama administration to produce a viable bill. Heading into the summit, FoxNews.com takes a look at the dozens of Democrats and Republicans expected to attend.