Tony Blair and Michael Wolff have each accused the other of lying in a row over the former’s Prime Minister’s alleged dealings with the Trump White House.

Mr Wolff, the American author and journalist, claimed in his bestselling book Fire and Fury, a fly-on-the-wall account of the first year of the Trump presidency, that Mr Blair made attempts to secure a job as Donald Trump’s Middle East envoy.

Mr Wolff also claimed that Mr Blair told the Trump administration that British intelligence services may have spied on them before President Trump assumed office.

At the time of the book’s publication in January, Mr Blair dismissed both claims, accusing Mr Wolff of “complete invention”.

The row reignited yesterday as Mr Wolff, who is Jewish, appeared on BBC One’s The Andrew Marr Show on Sunday, insisting that he overheard a conversation between Mr Blair and Jared Kushner, Mr Trump’s son-in-law, in which Mr Blair appeared to lobby for a position.

He said: “I sat in the White House on the couch listening. I wasn’t supposed to overhear this, but they were standing right there, with Tony Blair and Jared Kushner standing, not 15 feet in front of me, with Tony Blair – let me choose my words carefully – sucking up to Jared Kushner.”

Mr Marr quoted Mr Blair’s earlier denial, to which Mr Wolff commented that the former British Prime Minister was a “complete liar”.

Mr Blair later responded with a statement issued through his think-tank, the Tony Blair Institute for Global Change, saying that “this story is a complete fabrication”.

It read: “Michael Wolff has never been present at any conversation between Jared Kushner and Mr Blair. He [Mr Blair] neither sought such a role from Jared Kushner nor was offered one. And we note that many people have had the same experience with Michael Wolff.”