Update at 4:05 p.m. ET
Sen. John McCain, diagnosed with a deadly form of brain cancer just five days ago, returned to applause on Senate floor Tuesday, where he cast a crucial vote to move forward on repeal of the Affordable Care Act and urged his colleagues to regain their sense of bipartisan cooperation.
However, the longtime Arizona senator, two-time presidential candidate and perhaps America's most famous former prisoner of war, warned that he "will not vote for this bill as it is today." He called it a "shell of a bill."