President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
People in the audience cheer as President Donald Trump speaks at a campaign rally at Minuteman Aviation Hangar, Thursday, Oct. 18, 2018, in Missoula, Mont. (AP Photo/Carolyn Kaster)
President Donald Trump shakes hands with Montana State Auditor Matt Rosendale, who is running against Sen. Jon Tester, D-Mont., during a campaign rally at Minuteman Aviation Hangar, Thursday, Oct. 18, 2018, in Missoula, Mont. (AP Photo/Carolyn Kaster)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump arrives as the sun sets to speak at a campaign rally at Minuteman Aviation Hangar, Thursday, Oct. 18, 2018, in Missoula, Mont. (AP Photo/Carolyn Kaster)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump speaks at a campaign rally at Minuteman Aviation Hangar, Thursday, Oct. 18, 2018, in Missoula, Mont. (AP Photo/Carolyn Kaster)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump waves as he boards Air Force One, Thursday, Oct. 18, 2018, in Andrews Air Force Base, Md., en route to speak at a campaign rally in Neptune Aviation Services, Missoula, Mont. (AP Photo/Carolyn Kaster)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
People in the audience cheer as President Donald Trump speaks at a campaign rally at Minuteman Aviation Hangar, Thursday, Oct. 18, 2018, in Missoula, Mont. (AP Photo/Carolyn Kaster)
President Donald Trump shakes hands with Montana State Auditor Matt Rosendale, who is running against Sen. Jon Tester, D-Mont., during a campaign rally at Minuteman Aviation Hangar, Thursday, Oct. 18, 2018, in Missoula, Mont. (AP Photo/Carolyn Kaster)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump arrives as the sun sets to speak at a campaign rally at Minuteman Aviation Hangar, Thursday, Oct. 18, 2018, in Missoula, Mont. (AP Photo/Carolyn Kaster)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump speaks at a campaign rally at Minuteman Aviation Hangar, Thursday, Oct. 18, 2018, in Missoula, Mont. (AP Photo/Carolyn Kaster)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump waves as he boards Air Force One, Thursday, Oct. 18, 2018, in Andrews Air Force Base, Md., en route to speak at a campaign rally in Neptune Aviation Services, Missoula, Mont. (AP Photo/Carolyn Kaster)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump on the campaign trail in Missoula on Oct. 18. (Erin Jusseaume photo)
President Donald Trump on the campaign trail in Missoula on Thursday, Oct. 18.