AP Photo
FILE - In this July 19, 2017 photo, Sen. Jeff Flake, R-Ariz. walks to his seat as he attends a luncheon with other GOP Senators and President Donald Trump at the White House in Washington. Flakeís re-election race is becoming a case study in the GOPís convulsions between the establishment, a furious base, and angry donors. (AP Photo/Pablo Martinez Monsivais, File)