“If the debt limit remains unchanged, there is significant risk that at some point in the first two weeks of June, the government will no longer be able to pay all of its obligations,” said the CBO report.

The new report came as the White House and congressional leaders postponed a scheduled Friday meeting to continue negotiations, citing little progress so far over any deal to cut spending and pair that with a debt limit hike.

Read more: Confused about the debt ceiling? Here’s what you need to know

“The extent to which the Treasury will be able to fund the government’s ongoing operations will remain uncertain throughout May, even if the Treasury ultimately runs out of funds in early June. That uncertainty exists because the timing and amount of revenue collections and outlays over the intervening weeks could differ from CBO’s projections.”

The CBO also issued an updated projection of the federal budget deficit for 2023, raising it to $1.5 trillion.

The office warned that there was still “a great deal of uncertainty” around the deficit figure, in part due to an expected Supreme Court ruling on President Joe Biden’s student loan forgiveness plan.

Legal experts told CNBC the nation’s highest court is likely to strike down the $400 billion debt forgiveness plan, given the court’s conservative majority.

If that happens, the administration would likely record the money it set aside for the loan forgiveness last year as a reduction in outlays this year, the CBO reported.

The CBO is a nonpartisan federal agency that provides objective budget and economic data to Congress, typically to inform legislation.

The debt ceiling talks were postponed less than a day before Biden was set to sit down with House Speaker Kevin McCarthy, R-Calif., Senate Minority Leader Mitch McConnell, R-Ky., Senate Majority Leader Chuck Schumer, D-N.Y., and House Minority Leader Hakeem Jeffries, D-N.Y.

This is a developing story, please check back for updates.