Trump tweets health bill 'will get even better' at lunch

President Donald Trump on Wednesday stepped up the pressure on reluctant Republicans to erase much of Barack Obama's health care law, tweeting, "They MUST keep their promise to America" and vowing the measure would improve at his White House lunch with senators.In a last-ditch effort to revive the bill, Trump invited all 52 Republicans to the White House, a day after the GOP's seven-year quest crashed and burned in a humiliating defeat for the president, Majority Leader Mitch McConnell and the G