The agreement prompted a backlash within the party, not only against the Democratic defectors who supported it, but against Senator Chuck Schumer, the leader who did not.
Senators Catherine Cortez Masto, Maggie Hassan, Jeanne Shaheen, Angus King and Tim Kaine, who voted with Republicans to end the government shutdown, at the Capitol on Sunday night.
For 40 days, Senator Chuck Schumer kept his caucus unified. But an end approached without an extension of expiring health insurance subsidies that Democrats had demanded.
Senator Angus King, one of the senators who negotiated with Republicans, said that the length of the shutdown had pushed some colleagues to support a deal without the extension of Affordable Care Act subsidies they had originally sought.
A small but critical group of Democrats backed legislation to fund the government, providing the votes to move forward with a spending package that would end the shutdown in coming days.
Senator Angus King spoke to reporters alongside Senator Tim Kaine and Senator Maggie Hassan on Capitol Hill on Sunday night, to explain why they voted with Republicans to move toward ending the government shutdown.