The House Republican plan to phase out the Obamacare Medicaid expansion by 2020 may be a nonstarter for some Senate Republicans-and could potentially threaten the larger repeal-and-replace process. Shortly before House lawmakers revealed a revamped version of their Obamacare repeal-and-replace bill Monday evening, four Republican senators sent a letter to Majority Leader Mitch McConnell saying they would not support an earlier draft from Feb. 10 that repeals Medicaid expansion because it “does not meet the test of stability for individuals currently enrolled in the program.”