washington u.s. republicans tuesday fell short yet seven-year drive repeal obamacare bitter defeat raise question ability enact president donald trump agenda party unable win enough support senators bill repeal 2010 affordable care act decide put vote several republicans say bill sponsor vow try face steep odds sunday special rule expire allow pass healthcare legislation without democratic support basically run time say senator ron johnson co-sponsor measure senators bill cassidy lindsey graham dean heller republicans repeatedly fail deliver longtime promise roll back former democratic president barack obama signature domestic accomplishment yet achieve major domestic policy successes congress year could hurt efforts retain control senate house representatives november 2018 congressional elections republicans widely view obamacare provide coverage 20 million americans costly government overreach trump vow frequently 2016 election campaign scrap democrats fiercely defend say extend health insurance millions fall short july senate republicans try month bill would give state great control hundreds billions dollars federal government spend annually health care run objections members right center oppose repeal essentially opposite reason senator susan collins moderate complain undermine medicaid program poor weaken consumer protections senator rand paul conservative say leave many obamacare regulations spend program place democrats say time republicans work fix obamacare shortcomings republican senator lamar alexander say would resume talk democratic senator patty murray shore law insurance subsidies share healthcare providers end broadly high hospital company hca healthcare inc rise 1.8 percent insurer centene corp focus medicaid rise 2.2 percent insurance industry hospitals medical advocacy group american medical association american heart association american cancer society aarp advocacy group elderly consumer activists oppose late bill trump say tuesday administration disappoint certain so-called republicans support bill republican president say late still give hope law would eventually repeal happen tell reporters travel new york fundraiser republicans hold slim 52-48 majority senate least three senators collins paul john mccain arizona publicly reject bill republicans craft special rule early year allow pass bill simple majority 100-seat chamber rule expire start new fiscal year sunday need least 60 vote advance legislation john thune member republican leadership senate say party would likely try undo obamacare clear enough vote say party would focus overhaul u.s. tax code another complex undertake could meet stiff resistance wide range interest group cbs poll monday show 52 percent americans disapprove graham-cassidy healthcare bill 20 percent approve readily admit republican party do bad job explain term replace obamacare republican senator ben sasse say senate floor six protesters stag die-in floor senate office build lie grind cover head body white shroud represent say would live lose bill pass non-partisan congressional budget office say number people health insurance cover high-cost medical events would slash millions late republican bill become law cbo also find federal spend medicaid would cut trillion 2017 2026 millions people would lose coverage program mainly repeal federal fund obamacare medicaid expansion republicans fail kill obamacare senate