WASHINGTON (AP) -- Senate leaders are optimistic about forging an eleventh-hour bipartisan deal preventing a possible federal default and ending the partial government shutdown after Republican divisions forced GOP leaders to drop efforts to ram their own version through the House.
Pressured by the calendar, financial markets and public opinion polls, Senate Majority Leader Harry Reid, D-Nev., and Minority Leader Mitch McConnell, R-Ky., were hoping to shake hands on an agreement Wednesday and, if possible, hold votes later in the day.
Driving their urgency were oft-repeated Obama administration warnings that the government would exhaust its borrowing authority Thursday and risk a federal default that could unhinge the world economy. Lawmakers feared that spooked financial markets would plunge unless a deal was at hand and that voters would take it out on incumbents in next year's congressional elections.
"People are so tired of this," President Barack Obama said Tuesday in an interview with Los Angeles TV station KMEX.
Feeding concerns were a warning Tuesday from the Fitch credit rating agency that due to the budget impasse it was reviewing its AAA rating on U.S. government debt for possible downgrade. Stock markets gave negative reviews as well, with the Dow Jones industrial average and Standard & Poor's 500 index both dropping Tuesday by nearly 1 percent.
John Chambers, chairman of Standard & Poor's Sovereign Debt Committee, told "CBS This Morning" on Wednesday that a U.S. government default on its debts would be "much worse than Lehman Brothers," the investment firm whose 2008 collapse led to the global financial crisis.
Billionaire investor Warren Buffett told CNBC he doesn't think the federal government will fail to pay its bills, but "if it does happen, it's a pure act of idiocy."
Rep. Steve King, R-Iowa, a tea party favorite, said he was not worried about the prospect of a U.S. default.
"We are going to service our debt," he told CNN. "But I am concerned about all the rhetoric around this ....I'm concerned that it will scare the markets."
Aides to Reid and McConnell said the two men had resumed talks, including a Tuesday night conversation, and were hopeful about striking an agreement that could pass both houses.
It was expected to mirror a deal the leaders had neared Monday. That agreement was described as extending the debt limit through Feb. 7, immediately reopening the government fully and keeping agencies running until Jan. 15 - leaving lawmakers clashing over the same disputes in the near future.
It also set a mid-December deadline for bipartisan budget negotiators to report on efforts to reach compromise on longer-term issues like spending cuts. And it likely would require the Obama administration to certify that it can verify the income of people who qualify for federal subsidies for medical insurance under the 2010 health care law.
But that emerging Senate pact was put on hold Tuesday, an extraordinary day that highlighted how unruly rank-and-file House Republicans can be, even when the stakes are high. Facing solid Democratic opposition, House Speaker John Boehner, R-Ohio, tried in vain to write legislation that would satisfy GOP lawmakers, especially conservatives.
Boehner crafted two versions of the bill, but neither made it to a House vote because both faced certain defeat. Working against him was word during the day from the influential group Heritage Action for America that his legislation was not conservative enough - a worrisome threat for many GOP lawmakers whose biggest electoral fears are of primary challenges from the right.
The last of Boehner's two bills had the same dates as the emerging Senate plan on the debt limit and shutdown.
But it also blocked federal payments for the president, members of Congress and other officials to help pay for their health care coverage. And it prevented the Obama administration from shifting funds among different accounts - as past Treasury secretaries have done - to let the government keep paying bills briefly after the federal debt limit has been reached.
Boehner's inability to produce a bill that could pass his own chamber likely means he will have to let the House vote on a Senate compromise, even if that means it would pass with strong Democratic and weak GOP support. House Republican leaders have tried to avoid that scenario for fear that it would threaten their leadership, and some Republicans worried openly about that.
"Of all the damage to be done politically here, one of the greatest concerns I have is that somehow John Boehner gets compromised," said Sen. Lindsey Graham, R-S.C., a former House member and Boehner supporter.
With the default clock ticking ever louder, it was possible the House might vote first on a plan produced by Senate leaders. For procedural reasons, that could speed the measure's trip through Congress by removing some parliamentary barriers Senate opponents might erect.
The strains of the confrontation were showing among GOP lawmakers.
"It's time to reopen the government and ensure we don't default on our debt," Rep. Jaime Herrera Beutler, R-Wash., said in a written statement. "I will not vote for poison pills that have no chance of passing the Senate or being signed into law."
Associated Press writers David Espo, Andrew Taylor, Charles Babington, Stephen Ohlemacher, Henry C. Jackson and Donna Cassata contributed to this report.