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HANOVER, GERMANY - APRIL 25: U.S. President Barack Obama gives opening remarks at the Hannover Messe industrial trade fair on April 25, 2016 in Hanover, Germany. This is likely Obama's last trip to Germany as U.S. president. The Hannover Messe is the world's largest industrial trade fair. (Photo by Adam Berry/Getty Images)

HANOVER, GERMANY - APRIL 25:  U.S. President Barack Obama gives opening remarks at the Hannover Messe industrial trade fair on April 25, 2016 in Hanover, Germany. This is likely Obama's last trip to Germany as U.S. president. The Hannover Messe is the world's largest industrial trade fair.  (Photo by Adam Berry/Getty Images)