(COMBO) This combination of pictures created on May 19, 2026 shows (L/R) US Representatives Thomas Massie (L), Republican from Kentucky, in Washington, DC, on February 9, 2026 and former US Navy SEALs officer Ed Gallrein in Hebron, Kentucky, on March 11, 2026. US President Donald Trump's hold on his support base faces its latest test Tuesday, May 19, 2026, with voters deciding whether one of Congress's most independent conservatives can survive the Republican leader's full political firepower. Several states are holding primaries to pick candidates for the November midterm elections, but the standout contest is in Kentucky, where Trump aims to oust seven-term Republican Thomas Massie, one of the president's most persistent internal critics. (Photo by ANDREW CABALLERO-REYNOLDS and Jim WATSON / AFP via Getty Images)