Jack Schlossberg, President John F. Kennedy’s grandson, has publicly labeled his cousin, Robert F. Kennedy Jr., as a “Russian spy,” intensifying an ongoing family dispute over RFK Jr.’s political affiliations.

The accusation followed RFK Jr.’s contentious endorsement of Donald Trump, which came after he put his own independent 2024 presidential campaign on hold.

On social media, 31-year-old Schlossberg remarked, “RFK Jr. is so obviously a Russian spy. You all think I’m joking. Hahahaha.” Despite the seemingly lighthearted tone, the comment underscores deep divisions within the famed Kennedy family, a dynasty closely associated with Democratic principles. RFK Jr., 70, had already incurred his cousin’s displeasure earlier this year. Schlossberg characterized his campaign as an “embarrassment” and accused RFK Jr. of “capitalizing on Camelot, fame, conspiracy theories, and conflict for personal benefit.”

RFK Jr.’s choice to associate with Trump, a move widely perceived as an ideological departure within the family, has exacerbated the tension. In a press conference announcing his support for Trump, RFK Jr. commended the former president’s international relations performance, citing a mutual interest in combating corruption. Schlossberg retorted swiftly, stating, “Never been less surprised in my life. I’ve been saying it for over a year — RFK Jr. is for sale, works for Trump. Bedfellows and loving it.”

The Kennedy lineage has long stood for liberal politics and public service, making RFK Jr.’s deviation from family tradition particularly contentious. Family critics suggest his stances, such as vaccine skepticism and anti-establishment rhetoric, clash with the principles upheld by his late father, Robert F. Kennedy.

While RFK Jr. has yet to publicly respond to Schlossberg’s statements, his team has brushed off the criticism, describing them as “family disagreements exaggerated.” The Kennedy family, a beacon of Democratic unity for generations, is now grappling with a highly public internal conflict.