Two Republican lawmakers who had come out against the House bill to repeal the Affordable Care Act earlier this week reversed course on Wednesday and threw their support behind the plan after securing more money to help people with pre-existing medical conditions. Representatives Fred Upton of Michigan, an influential voice in Republican health policy, and Billy Long of Missouri, a close ally of President Trump’s, told reporters after a meeting with Mr. Trump on Wednesday that the latest revisions had won them over. Those included $8 billion in additional funds over five years to supplement the insurance of people with...