Former President Donald Trump criticized childhood vaccines and urged Robert F. Kennedy Jr. to drop out and join forces with him in a phone call over the weekend, according to a leaked video shared by the independent presidential candidate’s son.

The one minute and 40 second clip of Kennedy listening to Trump on speaker phone was captured on tape by an “in-house videographer,” Kennedy said on social media on Tuesday morning. He added he “should have ordered the videographer to stop recording immediately” and that he was “mortified that this was posted,” apologizing to Trump.

Kennedy’s son, Robert Kennedy III, posted the clip early on Tuesday morning and said it was filmed on Sunday, the day after Trump was shot at by a would-be assassin. The younger Kennedy later deleted the video. In the clip, Trump can be heard saying “I agree with you, man, something’s wrong with that whole system,” referring to vaccinations.

“When you feed a baby, Bobby, a vaccination that is like 38 different vaccines, and it looks like it's meant for a horse, not a, you know, 10 pound or 20 pound baby. It looks like you're giving, you should be giving a horse this,” Trump says. “And then you see the baby, all of a sudden starting to change radically. I've seen it too many times, and then you hear that it doesn't have an impact, right? But you and I talked about that a long time ago.”

Kennedy Jr. is one of the most prominent figures in the global antivaccine movement and has spent decades spreading falsehoods about the safety of widely used vaccines, including promoting the long disproven claim that childhood vaccines are connected to autism. Kennedy Jr. barely speaks in the short clip, attempting to interject at a couple points, but otherwise listens as Trump speaks.

“I am a firm believer that these sort of conversations should be had in public. Here’s Trump giving his real opinion to my dad about vaccinating kids,” Bobby Kennedy III wrote in his description of the video. “If I violated some kind of law in posting this my only wish is to have Dr. Anthony Fauci as my cellmate.”

President Joe Biden’s campaign drew a line between the conversation and the conspiracy theory about vaccines being linked to autism, though Trump does not explicitly mention autism and does not expand on his remark that babies “all of a sudden starting to change radically” after receiving vaccines.

“Americans across the political spectrum resoundingly support President Biden’s historic record and ongoing work to expand access to high quality, affordable health care and lower prescription drug costs, but Trump and his anti-vax bud ‘Bobby’ are spreading dangerous conspiracy theories that threaten the lifesaving care that tens of millions of people depend on," Biden campaign spokesperson Joe Costello said in a statement. "This leaked footage is further proof Trump can’t be trusted to protect Americans’ health care. It’s frightening, and if he gains power, it could be the devastating reality for working families across the country.”

Vaccines do not cause autism nor are they connected to the disorder, decades of scientific evidence and studies show. The vaccines recommended by the federal government for infants and children and required for most public school students have been taken by millions of Americans over the course of decades and have prevented deadly, contagious diseases from spreading. 

“Some children have minor side effects from getting a vaccine like a slight fever or swelling at the injection site. The risk for death or serious side effects is so small that it is hard to document,” according to Stanford Medicine Children’s Health, an affiliate of Stanford University and the largest health care system in the San Francisco Bay Area. “Many studies have been done to evaluate the safety of multiple vaccines. None has shown that multiple vaccines cause a problem.”

In the short clip shared on Tuesday, Trump also appears to encourage Kennedy Jr. to drop out and endorse him.

“I would love you to do stuff, and I think it'll be so good for you, so big for you, and we're way ahead of the guy,” Trump said, referring to Biden.

Kennedy Jr. met with Trump on Monday on the sidelines of the Republican National Convention in Milwaukee, reportedly to discuss getting behind Trump. Afterwards, he said the “main topic was national unity” and that he was not dropping out of the race.

In a conversation at the RNC on Tuesday, Donald Trump Jr. said that “maybe there’s a great place for him somewhere in an administration.”

“We’re probably very different politically. He comes from obviously a very left background and that’s fine, but that doesn’t mean there’s not an incredible role that he could execute or prosecute quite well in Washington, D.C.,” Trump Jr. told Axios co-founder Mike Allen. “I don’t know. I don’t have any inside scoop on that, certainly not now. But I’d love to see that happen.”

After initially running in the Democratic primary, Kennedy Jr. switched tracks to an independent run, topping out at around 10% in most national polls and is still working to get on the ballot in all 50 states. Both the Biden and the Trump campaigns have attacked him over fears he will appeal to some of their prospective voters.

The son of New York Sen. Robert F. Kennedy and the nephew of President John F. Kennedy, Kennedy Jr. has isolated himself from most in his dynastic political family over his opposition to vaccines and for his racist comments, among other scandals and outrages. He was recently accused of sexual assault by a former family babysitter and had to deny accusations that he once ate a dog. In May, he confirmed reports that a parasitic worm ate part of his brain, though he claims he has recovered from symptoms connected to that incident.

Speaking with Kennedy Jr. on Sunday, Trump went on to detail the phone call he had with Biden on Saturday night after the assassination attempt on the Republican candidate’s life at a rally in Pennsylvania. 

“You know, he's interesting. It was very nice, actually,” Trump said. “He called me and he said, ‘how did you choose to move to the right?’”

“I said, ‘I was just showing a chart.’ I didn't have to tell him the chart was on all the people pouring into our country, right?” Trump continued. “I just turned my head to show the chart…it felt like a giant, like the world's largest mosquito. And it was, it was a bullet.”

After requesting Secret Service protection for months — often citing his assassinated father and uncle — the Biden administration approved such protection for Kennedy Jr. on Monday after the attempt on Trump’s life and bipartisan calls for protection to be given, including from Trump himself.