When Finland wanted to join Nato to ward off Russian aggression, it knew it had a friend living in the White House and could count on President Joe Biden’s support. But to ensure that the US Senate would ratify its membership bid, Finland’s government decided to also seek out the President living in Florida.

And so Mikko Hautala, the Finnish ambassador to the United States at the time, made a point of speaking privately with former President Donald J. Trump to persuade him of the merits of his country’s joining the alliance. The goal was to head off any opposition by Trump, who has long been openly hostile toward Nato.

The strategy worked. Trump, who potentially could have ignited Republican opposition with a single intemperate social media post, remained publicly silent, and the Senate voted 95 to 1 to approve Finland’s admission to the alliance in August 2022. Had Trump spoken out against the move, it would have taken only 34 votes to block the two-thirds supermajority needed for ratification.

In the nearly four years since he left the White House, Trump has acted as something of a shadow President on international affairs operating out of what he used to call the Winter White House at his Mar-a-Lago estate in Florida. Even before he kicked off a comeback bid to reclaim his old office, foreign governments realised that Trump was still a force in American politics and that they needed to take him into account in their dealings with the US.

Now that he is the Republican nominee for President in next month’s election, foreign leaders have been playing up to Trump even more. A parade of world leaders has made the pilgrimage to Mar-a-Lago or to Trump Tower in New York, including the leaders of Ukraine, Israel, Poland, Hungary, Argentina, Qatar, the United Arab Emirates and other countries. The crown prince of Saudi Arabia rang up Trump’s cellphone. The newly elected Prime Minister of Britain dropped by last month for dinner.

“Very unusual for a former President,” said Jeremy Shapiro, a former state department official who is now director of the US programme at the European Council on Foreign Relations. “I suppose it comes from his status as both a former and possibly future president, which is of course unique.”

“As a former President, he has the contacts and the relationships,” Shapiro added. “As a possible future President, he has the potential power to deliver for foreign leaders in the not-too-distant future.”

The complicated diplomacy of dual and duelling Presidents was reinforced by a new book by the journalist Bob Woodward to be published by Simon & Schuster on Tuesday. The book, War, reports that an unnamed aide to Trump told Woodward that the former President since leaving office has spoken on multiple occasions with President Vladimir V. Putin of Russia, perhaps as many as seven times.

Trump and the Kremlin have disputed the report and 20 current and former Biden and Trump administration officials and intelligence officials have told The New York Times that they could not confirm it. But several veteran US officials said it was possible the two could have spoken without American intelligence agencies detecting the calls.

Many former Presidents maintain contacts with foreign leaders after leaving the White House. Richard Nixon regularly travelled the world as an elder statesman meeting with heads of state while Jimmy Carter established himself as a sort of globe-trotting troubleshooter in conflict zones or election monitor in fragile democracies. Bill Clinton, George W. Bush and Barack Obama often see overseas counterparts during their travels, at conferences or through charitable initiatives.

For the most part, those Presidents were not seen as enduring power brokers back in the US in the same way that Trump is, and they have generally operated within certain parameters, typically coordinating with the White House or state department. Carter at times went beyond what the sitting President of the moment wanted, for instance in negotiating with North Korea or urging United Nations members to oppose the Iraq war. But even then, foreign leaders did not regard him as a quasi President or President-in-waiting.

John R. Bolton, a former national security adviser to Trump who has become a vocal critic, recalled how former secretary of state Henry A. Kissinger used to joke that foreign leaders typically wanted to meet with him when they visited the US because he was a stop on the museum tour.

“They wanted to hear what Henry Kissinger had to say, they wanted to hear what Richard Nixon had to say,” Bolton said. “That’s not what they’re calling Donald Trump for. They want to try to get him to weigh in on the side they want to prevail or at least mitigate the downside if he came out the other way.”

“Trump ran his White House like a Middle East dictatorship, so these actions are par for the course with him,” said Brian Katulis, a senior fellow at the Middle East Institute. “But it’s off-the-charts unusual and potentially a major national security threat for a number of reasons.”

Trump has been indicted on charges of mishandling classified documents, although the case was dismissed for now on procedural grounds. Secret conversations in the middle of a war with the leader of a sanctioned American adversary like Putin would go beyond grip-and-grin photo ops at Mar-a-Lago, particularly because Trump has played an important role on the issue of aid to Ukraine in its war against Russian invaders.

Trump, long an admirer of Putin, has said that Russia’s full-scale invasion of Ukraine in 2022 was “very smart” and refused to say he hoped Ukraine would win. He went so far this year as to say he would “encourage” Russia to “do whatever the hell they want” in terms of attacking Nato allies that have not spent enough on their own militaries.

For months, Trump was the key figure in the congressional fight over more military assistance to Ukraine as House Speaker Mike Johnson blocked Biden’s aid package in deference to the former President. This “was a source of great frustration to other countries seeking to strengthen the Ukrainian resistance,” said Peter Westmacott, a former British ambassador to the US.

Trump was lobbied by competing world leaders. In March, he hosted Prime Minister Viktor Orban of Hungary, a sceptic of helping Ukraine. Then in April, David Cameron, the foreign secretary of Britain at the time, travelled to Mar-a-Lago and a week later President Andrzej Duda of Poland met with Trump in New York, both to implore the former President to release his effective hold on the Ukrainian aid.

Days later, with Johnson finally putting the measure on the floor, Congress passed $60.8 billion in aid to Ukraine in both chambers on strong bipartisan votes, although a majority of Republicans still voted against it in the House.

The dispute left President Volodymyr Zelensky of Ukraine in an awkward position. A senior official in his government said that Zelensky had avoided any “back-channeling or gamesmanship” with Trump and sought to deal with him only through formal channels.

Zelensky understands that he needs to maintain bipartisan support, and he will work with whoever wins the election, the official said. Nonetheless, he found himself caught in the middle of American political crossfire when he accompanied Gov. Josh Shapiro, a Democrat and supporter of VicePresident Kamala Harris, on a visit to an ammunition factory in Scranton, Pa., last month to thank Americans for military hardware. Johnson blasted Zelensky and demanded he recall his ambassador.

In an interview with The New Yorker, Zelensky also questioned Trump’s claim to be able to settle the war in 24 hours if elected. Trump fired back. “The President of Ukraine is in our country,” he said at a campaign event. “He is making little nasty aspersions toward your favourite President — me. We continue to give billions of dollars to a man who refuses to make a deal — Zelensky.”

Zelensky then visited Trump at Trump Tower to smooth things over but as the two faced cameras the former President made a point of talking about what a good relationship he has with Putin, the man who has sent forces that have killed tens of thousands of Zelensky’s citizens.

In this campaign season, Zelensky is not the only foreign leader to make the trek to Trump’s doorstep. In fact, it has become a ritual now for some foreign leaders to have three meetings while in the US, one with Biden, another with Harris and a third with Trump.

New York Times News Service