DES MOINES, Iowa—Florida Gov. Ron DeSantis and former U.N. Ambassador Nikki Haley appear to be locked in a battle for second place in the Jan. 15 Iowa caucuses as former President Donald Trump continues to hold a commanding lead in the polls.
Ms. Haley eclipsed Mr. DeSantis in a pair of polls released last week but continues to trail President Trump by 28 percentage points.