Harris Says Trump Will Repeal Obamacare. Trump Now Claims He’ll Make It ‘Better.’

Vice President Kamala Harris and her running mate Tim Walz, the Minnesota governor, have quickly made the Affordable Care Act central to their campaign, raising the specter of another Republican repeal effort next year if former President Donald J. Trump wins the White House.

“If Donald Trump gets the chance, he will end the Affordable Care Act and take us back to a time when insurance companies had the power to deny people with pre-existing conditions,” Ms. Harris said at a rally in Philadelphia last week as she introduced Mr. Walz as her running mate. “You remember what that was like?”

The next day, Mr. Walz said at a rally in Detroit that Mr. Trump would continue trying to undermine the 2010 health law because “he doesn’t care...