Robert F. Kennedy Jr.’s 2024 presidential run is a “vanity project” and “embarrassment” that’s “trading in on Camelot, celebrity, conspiracy theories and conflict,” his cousin Jack Schlossberg decried Friday.

The 30-year-old son of Caroline Kennedy — and only grandson of her late father, President John F. Kennedy — went one step further and officially endorsed President Biden, who “shares his grandfather’s vision for America” and is “the greatest progressive president we’ve ever had.”