“I think they’re moving forward, but it’s hard to say. We haven’t figured it all out yet,” Biden told reporters at Joint Base Andrews.
“We will know more in the coming days,” he added.
Biden is scheduled to meet with House Speaker Kevin McCarthy and other congressional leaders within days to resume negotiations.
A meeting scheduled for Friday was canceled to allow discussions to continue.
Reuters reported that aides to Biden and McCarthy began discussing ways to limit federal spending at a time when talks were underway about raising the government’s debt ceiling to $31.4 trillion to avoid a default of payment.
The Treasury Department has said its coffers could run out by June 1 unless lawmakers raise the debt ceiling.
Republicans, who tightly control the House of Representatives, want to impose new limits on future spending before giving the go-ahead for more payments to cover borrowing on spending they approved earlier.
The US government had already reached the statutory borrowing limit in January, and since then the Treasury Department has used special accounting measures to make cash available. Yellen told Congress that those measures could end on June 1.
On Thursday, the International Monetary Fund expressed concern about the “serious repercussions” on the global economy of the US default.
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