President Trump, in fewer than two hours on the steaming fairgrounds in Des Moines, attracted thousands of supporters to his stops at the Iowa Pork Producers tent, a baby farm animal exhibit, and a popular Grand Concourse pub, according to reporters on the scene.

Just as Mr. DeSantis and his family were wrapping up their day at the fair, meeting with Iowa Republican leaders and activists, Mr. Trump descended into the huge scrum of backers accompanied by about a dozen Florida U.S. House members.

Right after the Florida governor was flipping burgers at the Iowa State Fair, President Trump's plane passed overhead. Supporters of the former president then chanted: "We want Trump" and "we love Trump," according to footage. At one point during the event, Mr. DeSantis was seen walking through a crowd of Trump supporters who were chanting "we love Trump."

In another instance, a plane flew over the fair with a banner that read: "Be likeable, Ron." It's not clear who commissioned the plane.