The CBO estimates that if Congress repeals Obamacare, 18 million would lose coverage next year alone.Senate Majority Leader Mitch McConnell of Ky. arrives on Capitol Hill in Washington, Thursday, July 13, 2017, where he is expected to present the GOP’s revised health care bill and push toward a showdown vote next week with opposition within the Republican ranks. CREDIT: AP Photo/J. Scott ApplewhiteAf...