Timothy Mellon, the largest single donor to Kennedy’s biggest super PAC, is also the largest backer of MAGA Inc. The reclusive billionaire from one of America’s wealthiest families, has over the past year given the Kennedy super PAC $US20 million and the Trump super PAC $US15 million, as of the most recent disclosures that were filed in March. Another prominent Kennedy backer is Patrick Byrne, the former CEO of Overstock.com who worked with Trump on his effort to overturn the 2020 election.

Trump himself is intensely interested in the third-party candidates, according to aides. He is eager to know what their effect is expected to be on the race and how they are polling, although his engagement beyond asking questions of those around him is unclear.

Trump has been worried about the Libertarian Party pulling conservative voters away from him in November. But Richard Grenell, who is the former acting director of national intelligence, has been using his connections with Libertarian activists and donors to try to persuade them to attack Biden more than Trump, according to people familiar with his efforts.

Other Trump supporters are trying to help third-party and independent candidates with the expensive and arduous process of gathering the signatures needed to get on state ballots. Scott Presler, the conservative activist whom Lara Trump said she wanted as an early hire at the Republican National Committee, publicly reached out on social media to Stein and Cornel West, a left-wing academic who is running for president as an independent, to offer his help in collecting signatures to get them on the ballot.

Presler could not be reached for comment.

The moves by Trump allies come as the Democratic Party has mobilised a team of lawyers to scrutinise outsider candidates, including looking into whether they’ve followed the rules to get on state ballots.

For decades, third-party candidacies have loomed large in US presidential elections. The best known in modern history is Ross Perot, whose run as a billionaire populist independent in 1992 garnered 19 per cent of the vote and helped Bill Clinton win with only 43 per cent of the popular vote. Ralph Nader, a Green Party candidate, siphoned votes away from vice president Al Gore in the nail-biter 2000 presidential race against George W. Bush.

And in 2016, Stein, as the Green Party candidate, gave a meaningful – and arguably election-deciding – boost to Trump by drawing progressive voters away from former secretary of state Hillary Clinton in Pennsylvania, Michigan and Wisconsin. That year, billionaire businessperson and Home Depot co-founder Bernie Marcus, a supporter of Trump, helped fund efforts to bolster Stein.

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Polling shows that third-party candidates could play an especially large role in 2024. Most Americans are unhappy with the choice between Trump and Biden. Voters are increasingly disillusioned with the two major parties, and trust in American institutions has eroded over the past 30 years. Those trends provide an opening for candidates who style themselves as anti-establishment outsiders willing to blow up the system. Trump took advantage of similar conditions in 2016.

In a Quinnipiac University poll in late March, Biden and Trump both received less than 40 per cent of the vote in a hypothetical five-way race, with Kennedy getting 13 per cent, Stein receiving 4 per cent and West capturing 3 per cent.

In the multicandidate race, Trump led by a single percentage point; Biden led Trump by 3 percentage points in a hypothetical head-to-head race.

“The path to victory here is clearly maximising the reach of these left-wing alternatives,” said Steve Bannon, the former White House chief strategist who also served as Trump’s campaign chair in 2016.

“No Republican knows that oil production under Biden is higher than ever. But Jill Stein’s people do,” Bannon added. “Stein is furious about the oil drilling. The college kids are furious about it. The more exposure these guys get, the better it is for us.”

Brian Hughes, a spokesperson for Trump, described Kennedy as a “leftist and liberal with a history of supporting an extreme environmental agenda”. He said more broadly of the Democratic push to challenge outsider candidates, “While Joe Biden and his allies claim to defend democracy, they are using financial and legal resources to prevent candidates access to the ballot”.

“President Trump believes any candidate who qualifies for the ballot should be allowed to make their case to America’s voters,” he added.

For months, the Trump team has been privately polling various iterations of third-party tickets in battleground states. It has concluded that candidates floated for the Green Party and No Labels, which recently abandoned its effort to field a presidential candidate, pulled substantially more votes from Biden than from Trump.

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A person briefed on other polling by Trump allies said that while it varied by state, Kennedy also pulls more votes from Biden than from Trump. The person cited as an example the Trump team’s recent private polling of voters in Arizona. Trump loses Hispanic voters by a close margin in a head-to-head contest against Biden there, but he wins Hispanic voters on the full ballot in Arizona – an indication that third-party candidates draw more heavily from Biden’s core constituencies than from Trump’s.

Still, Kennedy is seen as more of a potential threat to Trump. He has spent the past few years appearing on conservative news media programs and talking about issues like his fierce opposition to the COVID-19 vaccine. Advisers to Trump say that many Republican voters don’t know anything about Kennedy’s liberal views on gun control and the environment, and the Trump team hopes to bring back some of those voters after framing Kennedy as a liberal Democrat.

Allies of Trump and Biden are in a tug of war to define Kennedy, who has far more support than any other third-party candidate.

Democratic lawyers and operatives, many of whom have privately said that neither Gore nor Hillary Clinton had teams that took third-party candidates seriously enough, are fighting hard to keep Kennedy off the ballot. The Democratic National Committee hired Lis Smith, a veteran communications operative, and tasked her with branding Kennedy as a pro-Trump spoiler candidate.

Kennedy’s campaign and the super PACs backing him have paid an array of lawyers and consultants to secure ballot access. One of the consultants, Rita Palma, was captured in a video detailing a strategy to encourage New York voters to support Kennedy: “The Kennedy voter and the Trump voter, our mutual enemy is Biden.” Palma outlined a hypothetical scenario in which Kennedy would win enough electoral votes to prevent either Trump or Biden from winning 270 electoral votes, pushing the decision to Congress in what is known as a contingent election.

On her account on the social platform X, Palma has expressed support over the years for both Kennedy and Trump. In posts first reported by CNN on Tuesday, she had endorsed Trump’s false claims that the 2020 election was stolen and described Sidney Powell, who has pleaded guilty to six misdemeanour counts related to Trump’s efforts to overturn his 2020 election loss in Georgia, as “my person of the decade”.

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Stefanie Spear, a spokesperson for the Kennedy campaign, described Palma as “a ballot-access consultant” for upcoming signature collection efforts in New York. Of Palma’s remarks about the hypothetical scenario, Spear said Palma’s statements “in no way reflect the strategy of the Kennedy campaign”.

Spear did not respond to requests for comment about the Trump allies’ efforts to elevate Kennedy, or to inquiries about Palma’s support for Trump’s claims about the 2020 election.

Many conservative news media personalities and influencers recently turned against Kennedy after he decided to run as an independent instead of as a Democrat and it became apparent that he could pull votes from Trump.

Still, one complication with attacking Kennedy is that Trump has made clear that he likes him.

When The New York Post reported last month that Kennedy was accusing Nevada’s secretary of state, a Democrat, of corruptly denying his signature petitions, the Trump team discussed legal intervention, although no action appears to have been taken.

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Trump put out a statement on Truth Social, his social media platform, that called Kennedy “a radical-left Democrat,” but he has mostly laid off him otherwise. Trump has called Kennedy a “very smart person” and has even privately floated him as a potential running mate, though his advisers view that prospect as extremely unlikely.

An outside group aligned with Trump asked a question about a Trump-Kennedy ticket in a poll several weeks ago, according to a person with knowledge of the survey. The results were not particularly striking. Trump had told an ally that he believed Kennedy could help him with voters who were upset with him for his support of the COVID-19 vaccine.

“I like Trump-Kennedy. I like the way that sounds,” Trump told another ally recently. “There’s something about that that I like.”

This article originally appeared in The New York Times.