Independent presidential candidate Robert F. Kennedy Jr. speaks to supporters during a campaign event, Saturday, April 13, 2024, in West Des Moines, Iowa. (AP Photo/Charlie Neibergall)
Audience members listen to Independent presidential candidate Robert F. Kennedy Jr. speak during a campaign event, Saturday, April 13, 2024, in West Des Moines, Iowa. (AP Photo/Charlie Neibergall)
Local residents wait so sign their names to help Independent Presidential candidate Robert F. Kennedy, Jr. gain access to the Iowa ballot during a campaign event, Saturday, April 13, 2024, in West Des Moines, Iowa. (AP Photo/Charlie Neibergall)
Independent presidential candidate Robert F. Kennedy Jr. speaks to supporters during a campaign event, Saturday, April 13, 2024, in West Des Moines, Iowa. (AP Photo/Charlie Neibergall)
Independent presidential candidate Robert F. Kennedy Jr. speaks to supporters during a campaign event, Saturday, April 13, 2024, in West Des Moines, Iowa. (AP Photo/Charlie Neibergall)
Audience members react as they listen to Independent presidential candidate Robert F. Kennedy Jr. speak during a campaign event, Saturday, April 13, 2024, in West Des Moines, Iowa. (AP Photo/Charlie Neibergall)
Independent presidential candidate Robert F. Kennedy Jr. waits to speak at a campaign event, Saturday, April 13, 2024, in West Des Moines, Iowa. (AP Photo/Charlie Neibergall)