Iowa Governor Terry Branstad (L) shakes hands with Chinese President Xi Jinping before a meeting at the Great Hall of the People in Beijing on April 15, 2013. Branstad is in China until April 19. AFP PHOTO / POOL / Andy Wong
Iowa Governor Terry Branstad speaks to guests at the Iowa Freedom Summit on January 24, 2015 in Des Moines, Iowa. The summit is hosting a group of potential 2016 Republican presidential candidates to discuss core conservative principles ahead of the January 2016 Iowa Caucuses.
Upphovsman: Scott Olson
Republican Iowa Gov. Terry Branstad speaks during a campaign stop at the Amtrak Osceola Train Depot November 2, 2014 in Osceola, Iowa. A Des Moines Register poll published November 1, put Ernst seven points ahead of her opponent, Rep. Bruce Braley (D-IA), three days before the election. During a November 1, conference call, U.S. Senate Majority Leader Harry Reid (D-NV) told progerssive activists 'If we win Iowa, we're going to be just fine. Iowa is critical.'
Upphovsman: Chip Somodevilla
Gov. Terry Branstad (R-IA) stands in front of a cup cake display at his Birthday Bash October 25, 2014 in Clive, Iowa. Already distinguished as the states longest -serving governor, Branstad would become the longest -serving governor in U.S. history.were he to win the November 4th election.
Upphovsman: Steve Pope
Terry Branstad, governor of Iowa, speaks at an election night rally with Joni Ernst, newly elected Iowa Republican for U.S. Senate, not pictured, in West Des Moines, Iowa, U.S., on Tuesday, Nov. 4, 2014. Republicans roared back in the midterm elections on Tuesday, capturing control of the Senate from Democrats, holding on in crucial governor races and keeping their majority in the U.S. House. Photographer: Daniel Acker/Bloomberg via Getty Images
Rand Paul (R-KY) and Iowa Gov. Terry Branstad (R) listen to speakers at an event hosted by the Iowa GOP Des Moines Victory Office on August 6, 2014 in Urbandale, Iowa. Paul, who is expected to seek the 2016 Republican presidential nomination, was on a three-day, eight-city tour of Iowa, the first state in the nation to select the presidential nominee.
Upphovsman: Scott Olson
Terry Branstad, governor of Iowa, speaks during the Iowa Freedom Summit in Des Moines, Iowa, U.S., on Saturday, Jan. 24, 2015. The summit will focus on how to get America back on track by emphasizing core conservative principles of pro-growth economics, social conservatism, and a strong national defense. Photographer: Daniel Acker/Bloomberg via Getty Images