CHARLOTTE, N.C. — More than three-and-a-half years into his presidency and 40 days from an election, President Donald Trump on Thursday launched what aides termed a “vision” for health care heavy on unfulfilled aspirations. “This is affirmed, signed, and done, so we can put that to rest,” Trump said. He signed an executive order on a range of issues, including protecting people with preexisting medical conditions from insurance discrimination. But that right is already guaranteed in the Obama-era health law his administration is asking the Supreme Court to overturn. House Speaker Nancy Pelosi dismissively said Trump’s “bogus executive order on pre-existing conditions isn’t worth the paper it’s signed on.” Democrats are betting heavily that they have the edge on health care this election season. Trump spoke at an airport hangar in swing-state North Carolina to a crowd that included white-coated, mask-wearing health care workers.