"I lived with RFK Jr. in New York and watched him convince Governor Cuomo to make Environmental moves that were outright NASTY," he continued. "I’d even take Biden over Junior’, because our Country would last a year or two longer prior to collapse - But it would be dead either way."

"His Views on Vaccines are FAKE, as is everything else about his Candidacy," he added. "Let the Democrats have RFK Jr. They deserve him!"

The ex-president's rage toward RFK Jr. may be due to a new Quinnipiac poll that suggests his candidacy is more attractive to prospective Trump voters than Biden voters. That poll shows that while Trump is still slightly ahead of Biden in swing states, the two are in a dead heat nationally. And when RFK Jr. is thrown into the mix, Trump's vote share diminishes.

According to Axios, while Biden and Trump are tied in a head-to-head matchup with Kennedy on the ballot, Trump's share of votes is significantly larger when RFK Jr. isn't an option. This means that the independent's 2024 campaign could siphon off enough votes from Trump to push Biden over the edge in a close contest.

"That dynamic is consistent with two other polls — a Marist survey on Monday and a NBC News one on Sunday — that show Biden's margin increasing when RFK and other third party candidates are included," Axios reporter Hans Nichols wrote.

RFK Jr.'s appeal to Trump's base may be due to the conspiratorial tone of his campaign. Kennedy became well-known in the wake of the Covid-19 pandemic as a vaccine skeptic. In the past, Kennedy has said he is personally "pro-vaccine" and that he's had all of his children vaccinated, but he sang a different tune on a 2021 podcast. CNN reported that in an episode of the "Health Freedom for Humanity" podcast, RFK Jr. encouraged parents to tell strangers to not vaccinate their kids.

"For many, many years, I think parents were so gaslighted, and they were scapegoated, and they were vilified and marginalized, so that even parents of kids who were very, very badly injured, knew what happened to their kid, but they were just reluctant to talk about it," he said. "And I think now those days are over."

Kennedy has also repeated Republican talking points about gun violence. In 2023, he told NewsNation that he viewed the Second Amendment to the U.S. Constitution as reason to believe that gun control was a moot point, and added "I'm not going to take people's guns away."

"Anybody who tells you that they’re going to be able to reduce gun violence through gun control at this point I don’t think is being realistic," Kennedy said.