Liberal activists are ratcheting up pressure behind the scenes on congressional Democrats to play hardball with Republicans over a looming government shutdown — and party leaders appear to be heeding their call for now.

The progressive group MoveOn urged Senate Minority Leader Chuck Schumer and House Minority Leader Hakeem Jeffries in a private letter that they should “hold the line” and withhold their votes to keep the government open unless GOP lawmakers make concessions on health care policy. The memo, sent Monday, was shared first with POLITICO.

It is part of a growing chorus among liberals to exact some concessions from congressional…

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