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. When President Trump takes the stage this week at a rally in Phoenix, Arizona, the state's junior senator will be nowhere to be seen. But Trump is likely to save some choice words for Sen. Flake (AP Photo/Pablo Martinez Monsivais)