Republican lawmakers are upping the pressure on GOP leaders to extend enhanced health insurance subsidies set to expire at year’s end for those with Affordable Care Act coverage, bolstering similar demands from Democrats as part of government funding talks.

Outspoken factions in both chambers are doubling down on warnings it would be politically and economically untenable to allow the pandemic-era boost to Obamacare premium tax credits expire and would spike prices headed into an election year.