The US government remains partially paralysed for the second day running on Wednesday with no sign of a breakthrough in the budget deadlock.
The Democratic-controlled Senate has rejected a Republican proposal to restore funding only for certain programmes.
President Obama insists the government must be funded in full.
Earlier he accused Republicans of trying to sabotage his flagship health care law.
“Republicans in the House of Representatives refused to fund the government unless we defunded or dismantled the Affordable Care Act. They’ve shut down the government over an ideological crusade to deny affordable health insurance to millions of Americans. In other words, they demanded ransom just for doing their job,” he said.
The Republicans believe their mid-term election gains show Obama’s healthcare law is massively unpopular and blame the Democrats for refusing to negotiate.
“They also rejected our call to sit down and resolve our differences under the Constitution which makes it clear that if the two Houses disagree we should sit down and discuss and try to resolve those matters,” said the Speaker of the House of Representatives, John Boehner.
Republicans plan to try again on Wednesday to pass bills to restore funding to individual projects such as national parks.
The Senate is likely to block them again.
Meanwhile many government offices remain closed, with hundreds of thousands of employees out of work.