WASHINGTON — A trio of Senate Democrats urged Republican lawmakers at a Tuesday press conference to extend and make permanent the enhanced Affordable Care Act tax credits set to expire at the end of 2025. The credits are used by people who buy their own health insurance through the Affordable Care Act Marketplace. House GOP leadership did not negotiate with Democrats on the seven-week stopgap funding bill released on Tuesday. Premiums, on average, for enrollees would soar by more than 75% if the credits expire, according to the nonpartisan health research organization KFF. Meanwhile, open enrollment begins in November, meaning Congress would have to act before the end of the calendar year to avoid premium spikes.