The BBC informs, the Democrat-controlled US Senate is seeking a vote on its plan to raise the nation's $14.3tn (£8.7tn) debt limit, which could determine whether a deal to avoid government default is possible.
Senate leaders want a prompt vote so the plan can be passed on Sunday.
The debate comes a day after the Senate rejected a rival Republican bill passed in the House of Representatives.
President Obama urged Congress to get its house in order. The US risks default without a deal by 2 August.
The president backs Senate Majority Leader Harry Reid's proposal, which would cut $2.2tn from deficits and raise the debt ceiling by $2.7tn.
The Senate plan envisages raising the debt ceiling until after the 2012 elections. Republicans have sought a plan which raises the ceiling for just a few months.
Correspondents say the best hope to avoid default is for the Senate to pass an amended bill on Sunday which can be put to the House on Monday ahead of the deadline.
Democrat leaders in the Senate are said to be seeking agreement with Republicans to avoid procedural obstacles which could delay the Senate vote until Monday.
Mr Reid accused the Republicans of seeking to filibuster, or delay, proceedings.
"Unless there is a compromise, or they accept my bill, we're heading for economic disaster," he said.
Minority Leader Mitch McConnell accused the Democrats of stirring up opposition, but said he eagerly awaited Mr Reid's plan.
In a weekly radio address, Mr Obama reiterated that any solution on a default had to be bipartisan.
"There are multiple ways to resolve this problem," he said.
"Congress must find common ground on a plan that can get support from both parties in the House and in the Senate. And it has to be a plan that I can sign by Tuesday."