The yearlong rift within the Democratic Party over how far to go in confronting President Donald Trump reopened on Sunday night, when eight members of the Senate Democratic Caucus sided with Republicans on a bill to end the government shutdown without a pledge to protect the health insurance tax credits they had spent weeks arguing were a crucial part of any deal.

The move, which effectively broke the party’s 40-day standoff with Republicans, plunged Senate Minority Leader Chuck Schumer into perhaps the deepest political crisis of his eight-year tenure as a party leader, even though he voted against the bill and made clear he didn’t support it. Within hours of the vote, progressives were calling for his resignation, accusing him of presiding over a collapse in party discipline and o

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