WASHINGTON — A group of moderate Democrats has a tentative deal to reopen the government if Republicans promise to hold a vote on expiring health care subsidies by December, a potential breakthrough as lawmakers seek to end the shutdown.

The group of three former governors — New Hampshire Sen. Jeanne Shaheen, New Hampshire Sen. Maggie Hassan and Independent Sen. Angus King of Maine — has a deal to pass three annual spending bills and extend the rest of government funding until late January, according to three people familiar with the agreement who requested anonymity until the deal is made public.

The deal was far from final, and final passage of the legislation could take several days. Republicans had not yet said whether they support the deal, and it was unclear whether there would be

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