U.S. President-elect Donald Trump, left, shakes hands with Terry Branstad, governor of Iowa and Trump's pick to be the U.S. ambassador to China, during an event in Des Moines, Iowa, U.S., on Thursday, Dec. 8, 2016. Trump said China will soon have to "play by the rules" as he introduced the man he intends to nominate as his emissary to the U.S.s largest economic rival and most important trading partner. Photographer: Daniel Acker/Bloomberg via Getty Images