The group of former Republicans known as the Lincoln Project released an attack ad on Robert F. Kennedy Jr. on Friday.

This ad was posted on YouTube and has been viewed more than 224,000 times. It begins by referring to Kennedy’s father, Robert Kennedy, and uncle, John F. Kennedy, as “tragic leaders who were the best of America” in a voiceover while clips of the two late politicians are shown.

“Robert Kennedy Jr. Is a different kind of tragedy. A longtime heroin addict, Kennedy’s an anti-vaxxer extremist who thinks all vaccines are dangerous,” the video claims.

Kennedy’s various interviews on the subject of vaccines, particularly the COVID-19 vaccine, accompany the video. In one brief clip, Kennedy is heard implying that the coronavirus was “ethnically targeted.”

“Ethnically targeted? That’s racist and crazy. If you believe Covid was a conspiracy, if you are an anti-vaxxer, RFK Jr. is your guy,” the ad continues. “RFK Jr., a right-wing nut.”

In its video caption, the Lincoln Project claims “our fight against Trumpism is only beginning. We must combat these forces everywhere and at all times — our democracy depends on it.”

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While Kennedy’s relatives were both Democratic politicians, Kennedy is running for president this November as an independent candidate, which was a switch he made midway through his campaign. Prior to launching the campaign, Kennedy worked as an environmental lawyer.

Democrats have made a concerted effort to attack RFK Jr. and appear concerned he is poised to rip support away from President Joe Biden.