"That still leaves that one-third that we could actually have real chaos and no deal, and I think that would be a disaster," Bowles said in breakfast meeting in Washington, Bloomberg reported.
"I'm really worried. I believe the probability is we're going over the cliff," Bowles told journalists on the edges of the meeting.
Boehner also said he continued to oppose the expiration of tax cuts for top earners. While according to the Huffington Post, Republican Tom Cole told colleagues that even though he doesn't want the top tax rate bumped up to 39.6 per cent from 35 per cent his party should take that deal for now.
The willingness of Republicans to take the standoff down to the wire isn't clear. Last year they effectively allowed America's credit rating to be downgraded before allowing the debt ceiling to be raised and ensuring the federal government could pay its bills.
The Congressional Budget Office says failure to avert the crisis could push the economy back into recession and drive the jobless rate up to 9.1 per cent by the end of 2013 from 7.9 per cent currently.
Economic data out of the US wasn't reassuring either. Sales of new homes fell 0.3 per cent to an annual pace of 368,000 last month, Commerce Department figures showed. That missed the forecast in a Bloomberg survey of 390,000 sales.
The Federal Reserve's Beige Book business survey, based on accounts from the 12 district Fed banks, was scheduled for release at 2 p.m. Washington time, which is expected to show the world's biggest economy is continuing to grow at a modest pace.
On the London Stock Exchange, shares of BP slipped 0.4 per cent to 429.40 British pence. The energy giant has been temporarily banned from new US federal contracts as part of the punishment meted out for the Deepwater Horizon oil spill in 2010. BP has already agreed to plead guilty to criminal misconduct over the spill and pay fines of US$4.5 billion.
Equity markets in Europe were broadly stronger. Germany's DAX 30 gained 0.2 per cent and France's CAC 40 was up 0.4 per cent. The Stoxx 600 rose just 0.1 per cent.
In Spain, banks rescued as part of the European bailout announced they will shrink in size to regain control of their balance sheets. BFA-Bankia will eliminate 6,000 jobs, sell assets and close branches and is forecasting a 19 billion euro loss this year. It aims to return to profit next year.