WASHINGTON, DC - JULY 25: Sen. John McCain (R-AZ) gives a thumbs up to well wishers as he gets into his car at the US Capitol July 25, 2017 in Washington, DC. McCain was recently diagnosed with brain cancer but returned on the day the Senate is holding a key procedural vote on U.S. President Donald Trump's effort to repeal and replace the Affordable Care Act. (Photo by Mark Wilson/Getty Images)
