Over 3 million people will lose health coverage if Congress allows enhanced subsidies for insurance on the Obamacare exchanges to expire later this year, a key item of unfinished business for Democrats at risk of losing their majorities in November.

Democrats have sought, but so far failed, to extend temporary tax credits that were implemented in President Joe Biden’s pandemic relief plan for premiums on health plans purchased on the Obamacare exchanges. If the additional subsidies expire, 3.1 million Americans will no longer have insurance, according to a new report from the Urban Institute.