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Independent presidential candidate Robert F. Kennedy Jr. speaks to supporters during a campaign event, Sunday, April 21, 2024, in Royal Oak, Mich. (AP Photo/Jose Juarez)
FILE - Independent presidential candidate Robert F. Kennedy Jr. speaks to supporters during a campaign event, April 13, 2024, in West Des Moines, Iowa. Former President Donald Trump is known for leveling constant and often personal attacks on top rivals such as Joe Biden. Lately, he's increasingly turned that same caustic approach toward Kennedy Jr. (AP Photo/Charlie Neibergall, File)
Supporters of Independent presidential candidate Robert F. Kennedy Jr. line up outside the Royal Oak Music Theatre to hear him speak during a campaign event, Sunday, April 21, 2024, in Royal Oak, Mich. (AP Photo/Jose Juarez)
FILE - Republican presidential candidate former President Donald Trump speaks at a campaign rally on May 1, 2024, in Waukesha, Wis. Trump is known for leveling constant and often personal attacks on top rivals such as Joe Biden. Lately, he's increasingly turned that same caustic approach toward independent presidential candidate Robert F. Kennedy Jr. (AP Photo/Morry Gash, File)