Then, she says, "extraordinary measures" will be used to keep paying bills, which she expects to continue until "early June"...

"While Treasury is not currently able to provide an estimate of how long extraordinary measures will enable us to continue to pay the government's obligations, it is unlikely that cash and extraordinary measures will be exhausted before early June," Ms. Yellen wrote to Congressional leaders.

Honoring US debt is "a sacred obligation," and Congress will have to deal with it "without conditions, without games and without putting our economy at risk, " White House economic adviser Brian Deese says on Bloomberg TV, seemingly foregetting Democrats' historic gamesmanship with Trump over the debt ceiling. 

"The last thing that we can afford is to violate the Hippocratic oath by having a self-inflicted wound on the economy," he added.

As we detailed previously, Goldman's chief economist Jan Hatzius said:

"The debt limit likely poses the greatest political risk next year, and we expect it to rival the 2011 episode in its disruption to financial markets and the economy. That said, we do not expect Congress to enact major fiscal changes.