WASHINGTON — The Democratic-controlled Congress is poised for a chaotic week.

On Monday, the Senate is bracing for a vote — which Republicans have already vowed to block — to avert a government shutdown and a debt default. The government would shut down Friday if there's no resolution.

The House is expected to vote Thursday on an infrastructure bill that progressive Democrats have threatened to block to maximize their leverage over a separate multitrillion-dollar package. The vote had originally been scheduled for Monday.

House Speaker Nancy Pelosi, D-Calif., said Sunday that she was confident that the infrastructure bill would be passed this week but appeared to be giving herself extra time to lock up support. She said this week would be "a week of opportunity" in a letter to House Democrats late Sunday.

Pressed about the matter earlier in the day on ABC's "This Week," Pelosi said, "I'm never bringing a bill to the floor that doesn't have votes."