President Trump visits Louisville

President Donald Trump exits Air Force One at the Kentucky Air National Guard Base in Louisville, Ky., March 20, 2017. Trump was in Louisville to attend a rally at the Kentucky Exposition Center. (U.S. Air National Guard photo by Master Sgt. Phil Speck)

President Donald Trump exits Air Force One at the Kentucky Air National Guard Base in Louisville, Ky., March 20, 2017. Trump was in Louisville to attend a rally at the Kentucky Exposition Center. (U.S. Air National Guard photo by Master Sgt. Phil Speck)

President Donald Trump arrives at the Kentucky Air National Guard Base in Louisville, Ky., March 20, 2017 as a naval officer stands by to render a salute. Trump was in Louisville to attend a campaign rally at the Kentucky Exposition Center. (U.S. Air National Guard photo by Lt. Col. Dale Greer)

President Donald Trump arrives at the Kentucky Air National Guard Base in Louisville, Ky., March 20, 2017 as a naval officer stands by to render a salute. Trump was in Louisville to attend a campaign rally at the Kentucky Exposition Center. (U.S. Air National Guard photo by Lt. Col. Dale Greer)

Col. David Mounkes (second from right), commander of the 123rd Airlift Wing, and Chief Master Sgt. Ray Dawson (left), wing command chief, greet President Donald Trump as he arrives at the Kentucky Air National Guard Base in Louisville, Ky., March 20, 2017. Trump was in Louisville to attend a rally at the Kentucky Exposition Center. (U.S. Air National Guard photo by Master Sgt. Phil Speck)

Col. David Mounkes (second from right), commander of the 123rd Airlift Wing, and Chief Master Sgt. Ray Dawson (left), wing command chief, greet President Donald Trump as he arrives at the Kentucky Air National Guard Base in Louisville, Ky., March 20, 2017. Trump was in Louisville to attend a rally at the Kentucky Exposition Center. (U.S. Air National Guard photo by Master Sgt. Phil Speck)

Air Force One sits on the flight line at the Kentucky Air National Guard Base in Louisville, Ky., March 20, 2017. President Donald Trump was in Louisville to attend a campaign rally at the Kentucky Exposition Center. (U.S. Air National Guard photo by Lt. Col. Dale Greer)

Air Force One sits on the flight line at the Kentucky Air National Guard Base in Louisville, Ky., March 20, 2017. President Donald Trump was in Louisville to attend a campaign rally at the Kentucky Exposition Center. (U.S. Air National Guard photo by Lt. Col. Dale Greer)

LOUISVILLE, Ky. -- President Donald Trump arrived at the Kentucky Air National Guard Base aboard Air Force One on March 20, 2017. Trump was in Louisville to attend a campaign rally at the Kentucky Exposition Center.