however, as abc's chuck seibertson reports, the bill isn't dead just yet. >> reporter: after years of vowing to roll back obamacare, it's likely his presidential opponent who will ultimately save it. north is john mccain saying he'll -- senator john mccain saying he'll vote no on the gop's latest attempt at repeal and replace. mccain saying, i cannot in good conscience vote for the latest republican plan, adding a bill of this impact requires a bipartisan approach. this is the second time he's emerged as the destroyer of president trump's signature promise to voters. >> that was a totally unexpected thing. terrible. honestly, terrible. so he decided to do something different. and that's fine. i say we still have a chance. we're going to do it eventually. >> reporter: this latest version would give states the ability to craft their own coverage but with far less funding and no guarantee for patients with preexisting conditions. experts say it would leave millions without insurance. >> he doesn't know the difference between medicare and medicaid. he barely knows the difference between m

chuck seibertson, abc news, new york. >>> senator bernie sanders visited san francisco yesterday, rallying at a convention for nurses. abc 7 news reporter lonni rivera has the story. >> reporter: senator bernie sanders spoke to hundreds of nurses in san francisco about his medicare for all act. >> they understand they can't function effectively in a dysfunctional health care system. >> as an intensive care nursery nurse, infant mortality is high. and that's ridiculous. >> reporter: the vermont senator blasted republican efforts to repeal obamacare. >> how cruel, how immoral it is to say to those millions of americans, we are going to take away that health insurance that keeps you alive. >> reporter: he praised john mccain's decision not to support the graham/cassidy repeal and replace bill. >> john mccain has a conscience. and i wish very much that the rest of the republican leadership had that conscience as well. >> reporter: from health care to free higher education, sanders' stop at san francisco city college to applaud their first semester of tuition-free classes. several supporters ca