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Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, speaks during a campaign rally in Muscatine, Iowa, U.S., on Sunday, Jan. 24, 2016. The collapsing center of U.S. politics poses a growing threat to global business, according to Davos delegates who say they're watching anxiously as Trump and Bernie Sanders ride a populist wave in the presidential election. Photographer: Daniel Acker/Bloomberg via Getty Images

Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, speaks during a campaign rally in Muscatine, Iowa, U.S., on Sunday, Jan. 24, 2016. The collapsing center of U.S. politics poses a growing threat to global business, according to Davos delegates who say they're watching anxiously as Trump and Bernie Sanders ride a populist wave in the presidential election. Photographer: Daniel Acker/Bloomberg via Getty Images