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By Sam Cabral
BBC News, Washington
The White House and congressional Republicans have appointed a new set of negotiators, injecting fresh hope into talks to raise the US debt limit.
"Now we have a format, a structure," House of Representatives Speaker Kevin McCarthy told reporters, saying a deal was "possible" by the end of the week.
Without a deal, the US could enter a calamitous default on its $31.4tr (£25tr) debt as soon as 1 June.
The standoff has forced President Joe Biden to cut short a foreign trip.
Mr Biden departs later on Wednesday for Japan, where he will attend a Group of Seven (G7) summit, but he will return to Washington on Sunday, foregoing planned visits to Australia and Papua New Guinea.
Reaching the debt ceiling would mean the US government is unable to borrow any more money. This means it would no longer be able to pay the salaries of federal and military employees. Social Security cheques - payments that millions of pensioners in the US rely on - would also be suspended.
A failure to meet debt obligations, or a default, is also likely to trigger global financial chaos.
Following an hour-long Oval Office meeting on Tuesday between the Democratic president and the top four congressional leaders, both sides expressed cautious optimism that a deal was within reach.
Mr McCarthy later said the two sides remain far apart but that the country did not risk falling off a fiscal cliff as Republicans have "already taken default off the table".
"There's still work to do," Mr Biden said, describing the meeting as "good, productive".
Senior White House officials Steve Ricchetti, Shalanda Young and Louisa Terrell will now take the lead in negotiations for the president, while Louisiana Congressman Garret Graves, a key McCarthy ally, will represent House Republicans.
That is in addition to the daily meetings already taking place between senior White House and congressional aides.
But despite the new "structure" Mr McCarthy is touting, the clock is ticking ahead of the 1 June default deadline set out by the Treasury Department.
A deal to avoid this scenario has so far proven elusive. In April, Republicans proposed an agreement that would suspend the debt limit by $1.5tn or until 31 March 2024, whichever comes first.
In exchange for support for raising the debt ceiling, Republicans are demanding budget cuts and seeking to scupper several of Mr Biden's legislative priorities, including student loan forgiveness.
That idea has been forcefully rejected by Democrats in Congress, and the White House has repeatedly said that a potential debt default and budgetary issues should be separate.
With lawmakers only in session in Washington for a handful of days until then, House Democrats will make a long-shot bid later on Wednesday to force a vote on lifting the debt ceiling alone.
Urging his party's members to get behind the effort, Democratic House leader Hakeem Jeffries said he is "hopeful that a real pathway exists to find an acceptable, bipartisan resolution that prevents a default" but "it is important that all legislative options be pursued in the event that no agreement is reached".
The US debt ceiling has been raised, extended or revised 78 times since 1960.
The last time the country was approaching a default, back in 2011, lawmakers struck a deal only hours before the deadline.
That standoff led to a downgrade in the US credit rating, sent the stock market plummeting and increased the government's borrowing costs.