Donald Trump secretly slipped Vladimir Putin some American Covid tests for his personal use, a bombshell new book has claimed.Trump allegedly supplied the Kremlin with tests – which, at the time, were in short supply – to be used by the Russian premier at the height of the Covid pandemic.The book, War, by veteran American journalist Bob Woodward, who broke the Watergate scandal, said a former Trump aide had told him about the hushed-up shipment.Woodward said that Putin had warned Trump not to reveal that he had supplied the tests over fears of a public backlash in the US.Bob Woodward said a former Trump aide had told him about the hushed-up shipmentREUTERSIn the book, he writes that the Russian leader told Trump: “I don’t want you to tell anybody because people will get mad at you, not me.”Trump has – and continues to – come under fire for his links to Putin, and Woodward writes how the two leaders held a phone call as recently as early this year, just as Trump’s successor Joe Biden was sending more weapons to Ukraine.”War” alleges that Trump has secretly maintained a close relationship with the Russian President since leaving the White House in January 2021.Regardless, in public, Trump has made headline-grabbing claims about Putin – telling GB News the latter “would not have invaded Ukraine” had he still been in office.The book claims that the pair have spoken as many as seven times – prompting its author to conclude that Trump is a worse President than even Richard Nixon, who resigned over Watergate.LATEST ON DONALD TRUMP:Biden is accused of describing Israeli PM Benjamin Netanyahu as a “son of a b***h”REUTERS”Trump was the most reckless and impulsive president in American history – and is demonstrating the very same character as a presidential candidate in 2024,” Woodward wrote.The book has also brought fresh details to light about the outgoing Biden’s approach to world leaders. Behind closed doors, the 81-year-old incumbent president is accused of describing Israeli PM Benjamin Netanyahu as a “son of a b***h” and a “bad f**king guy”.In public, Biden has remained a staunch supporter of Netanyahu in his war against Hamas.Biden is said to have described Putin as “the epitome of evil” behind closed doorsREUTERSWoodward also reveals that Biden believed that, at one point in the Ukraine war, there was a 50 per cent chance that Putin would use nuclear weapons on the battlefield – and had intelligence as early as October 2021, four months before Russia’s so-called “special military operation”, which suggested Putin was planning to invade Ukraine.Some of the intelligence obtained by the Biden administration, Woodward writes, reportedly came from a spy run by the US intelligence services inside the Kremlin.Biden is said to have described Putin as “the epitome of evil” behind closed doors.But Steven Cheung, a spokesman for the Trump campaign, has denied the account of his man’s relationship with Putin, and claimed Trump had given the reporter “no access”.”None of these made-up stories by Bob Woodward are true,” he said.