Republican presidential candidate Sen. Ted Cruz speaks at a caucus night rally, Feb. 1, 2016 in Des Moines, Iowa.

Republican caucus-goers sign in ahead of the party caucus in precinct 317 at Valley Church, Feb. 1, 2016 in West Des Moines, Iowa.

Republican presidential candidate Donald Trump gestures to his supporters after finishing second in the Iowa Caucus, in West Des Moines, Iowa, Feb. 1, 2016.

Hayley Kibbe holds her eight-month-old son Beau at Republican presidential candidate Donald Trump's Iowa Caucus night gathering, Feb. 1, 2016 in Des Moines, Iowa.

Republican presidential candidate Sen. Marco Rubio visits with voters at a caucus site, Feb. 1, 2016, in Des Moines, Iowa.

A supporter listens as Republican presidential candidate Sen. Marco Rubio addresses a crowd, Feb. 1, 2016 in Des Moines, Iowa.

Democratic presidential candidate Hillary Clinton speaks to supporters as former President Bill Clinton and daughter Chelsea Clinton look on during her caucus night event, Feb. 1, 2016 in Des Moines, Iowa.

A supporter arrives for the caucus night event of Democratic presidential candidate Hillary Clinton in the Olmsted Center at Drake University, Feb. 1, 2016 in Des Moines, Iowa.

Democratic presidential candidate Bernie Sanders speaks during his Caucus night event, Feb. 1, 2016 in Des Moines, Iowa.

Supporters cheer as they wait for results during Democratic presidential candidate Sen. Bernie Sanders' caucus night party, Feb. 1, 2016 in Des Moines, Iowa.

Ballots are counted following the Republican party caucus in precinct 317 at Valley Church, Feb. 1, 2016 in West Des Moines, Iowa.

Democratic presidential candidate and former Maryland Gov. Martin O'Malley speaks during a campaign stop at his field office in Sioux City, Iowa, on Jan. 29, 2016.

Republican presidential candidate Jeb Bush speaks at a campaign event in Des Moines, Iowa, Feb. 1, 2016.

Mary Pat Christie, wife of Republican presidential candidate Chris Christie, laughs as her husband impersonates Republican presidential candidate Donald Trump during a town hall at Morningside College in Sioux City, Iowa, Jan. 31, 2016.

Republican presidential candidate Sen. Rand Paul conducts an interview after a campaign event at the University of Iowa, Jan. 31, 2016 in Iowa City, Iowa.

Republican presidential candidate Ben Carson poses for a picture with an audience member following a campaign event at Fireside Pub and Steak House on Jan. 31, 2016 in Manchester, Iowa.