(TNS) — With third-party presidential candidate Robert F. Kennedy Jr. poised to announce his running mate Tuesday, the Biden campaign is bearing down on him as a potential spoiler in 2024.

As Axios reports, President Joe Biden wants his re-election bid to be a stark choice “between Biden’s stability and Trump’s chaos and divisiveness.” Having RFK Jr. in he race as a third wheel not only muddies the message, it could siphon enough votes from Biden in swing states to matter.

After all, Kennedy, despite his anti-vaccine stands and “fringe” views on the COVID-19 pandemic, is still part of the almost-mythical political family that became a Democrat dynasty. He’s the nephew of President John F. Kennedy and son of former U.S. Attorney General Robert Kennedy.

Axios writes:

“The Biden team is so worried about Robert F. Kennedy Jr.’s potential impact on the election that it’s built an entire operation dedicated to attacking Kennedy… Biden’s campaign and the Democratic National Committee have dedicated a team of staffers and consultants to try to diminish Kennedy. The DNC argues that RFK Jr. is a “stalking horse” for Trump who shares a megadonor — businessman Tim Mellon — with the former president. Mellon has given $20 million to Kennedy’s super PAC and $15 million to Trump’s MAGA Inc. this election cycle. The White House also notes that the Kennedy family — royalty in Democratic politics — has been critical of RFK Jr.’s bid.”

All this as the Donald Trump campaign takes a “wait-and-see” approach on Kennedy, who’s scheduled to reveal his choice for vice president on Tuesday – expected to be his most high-profile move to date.

While Axios notes “that Kennedy’s criticism of vaccines is attractive to some of Trump’s base,” the Trump team “sees Kennedy as hurting Biden’s standing in polls more than hurting Trump.” As a result, they’re taking a hands-off approach to the Kennedy campaign – at least for now.

This marks a change from the Trump team’s initial reaction to the Kennedy bid when the campaign dismissed it as “a vanity project for a liberal Kennedy,” Axios points out, adding: “The Republican National Committee put out a list of reasons why he should be viewed as a “radical Democrat,” noting his call to cut back on fossil fuels.”

Meanwhile the Kennedy campaign still has its work cut out getting on the ballot in a majority of states.

Axios writes:

“Kennedy is officially on the ballot in just one state now — Utah. His campaign claims it has enough signatures in New Hampshire, Nevada and Hawaii to get on those states’ ballots. American Values 2024 says it has collected enough signatures to get him on ballots in other key states, including Michigan, Arizona and Georgia.”