Former presidential candidate Doug Burgum endorses Trump on eve of Iowa caucuses

North Dakota Republican Gov. Doug Burgum endorsed Donald Trump for president on the eve of the Iowa caucuses after dropping his own bid for the presidency last month.

Burgum, who became the first of Trump's former GOP rivals to endorse him for president, joined Trump on stage at a campaign rally Sunday. 

"Four years ago, I was speaking on behalf of President Trump at the Iowa caucuses in Sioux City, and today, I'm here to do something that none of the other presidential primary candidates have done," Gov. Burgum said. "And that's endorse Donald J. Trump for the president of the United States of America."