The Senate took the first step to end the U.S. government shutdown on Sunday after a group of moderate Democrats agreed to proceed without a guaranteed extension of health care subsidies, angering many in their caucus who say Americans want them to continue the fight.

In a test vote that is the first in a series of required procedural maneuvers, the Senate voted 60-40 to move toward passing compromise legislation to fund the government and hold a later vote on extending Affordable Care Act tax credits that expire Jan. 1. Final passage could be several days away if Democrats object and delay the process.

The agreement does not guarantee the Affordable Care Act subsidies will be extended, as Democrats have demanded for almost six weeks. Senate Democratic leader Chuck Schumer of New York voted against moving ahead with the package, along with all but eight of his Democratic colleagues.

A group of three former governors — New Hampshire Sen. Jeanne Shaheen, New Hampshire Sen. Maggie Hassan and Independent Sen. Angus King of Maine — broke the six-week stalemate on Sunday when they agreed to vote to advance three bipartisan annual spending bills and extend the rest of government funding until late January in exchange for a mid-December vote on extending the health care tax credits. The agreement also includes a reversal of the mass firings of federal workers by the Trump administration since the shutdown began on Oct. 1 and would ensure that federal workers receive back pay.

Senate Majority Leader John Thune quickly endorsed the deal and called the immediate vote to begin the process of approving it as the shutdown continued to disrupt flights nationwide, threaten food assistance for millions of Americans and leave federal workers without pay.

"The time to act is now,” Thune said.

In addition to Shaheen, King and Hassan, Democratic Sen. Tim Kaine of Virginia, home to tens of thousands of federal workers, also voted in favor of moving forward on the agreement. Illinois Sen. Dick Durbin, the No. 2 Democrat, Pennsylvania Sen. John Fetterman and Nevada Sens. Catherine Cortez Masto and Jacky Rosen also voted yes.

The moderates had expected a larger number of Democrats to vote with them as around 10-12 Democratic senators had been part of the negotiations. But in the end, only five Democrats switched their votes — the exact number that Republicans needed. King, Cortez Masto and Fetterman had already been voting to open the government since Oct. 1.

The vote was temporarily delayed on Sunday evening as three conservatives who often criticize spending bills, Republican Sens. Mike Lee of Utah, Rick Scott of Florida and Ron Johnson of Wisconsin, withheld their votes and huddled with Thune at the back of the chamber. They eventually voted yes after speaking to Trump, Lee said.

Another Republican, Sen John Cornyn of Texas, had to fly back from Texas to deliver the crucial 60th vote.