The U.S. Treasury Department reiterated Monday it expects to be able to pay the U.S. government's bills only through June 1 without a debt limit increase, increasing pressure on congressional Republicans and the White House to reach a deal in coming days.

In her second letter to Congress in two weeks, Treasury Secretary Janet Yellen confirmed that the agency will be unlikely to meet all U.S. government payment obligations by early June, triggering the first-ever U.S. default. The debt ceiling could become binding by June 1, she said.

The new date reflects further data on revenues and payments received since Yellen told Congress on May 1 that the Treasury would likely run out of cash to pay government bills in early June, and potentially as early as June 1. It comes a day before U.S. President Joe Biden is expected to meet House Speaker Kevin McCarthy for talks, and ahead of an overseas trip for the president that starts Wednesday.