Donald Trump’s former chief strategist Steve Bannon has described the Trump Tower meeting between the president’s son and a group of Russians during the 2016 election campaign as “treasonous” and “unpatriotic”, according to an explosive new book seen by the Guardian.

Trump-Russia investigation: the key questions answered 
Read moreBannon, speaking to author Michael Wolff, warned that the investigation into alleged collusion with the Kremlin will focus on money laundering and predicted: “They’re going to crack Don Junior like an egg on national TV.”

Fire and Fury: Inside the Trump White House, reportedly based on more than 200 interviews with the president, his inner circle and players in and around the administration, is one of the most eagerly awaited political books of the year. In it, Wolff lifts the lid on a White House lurching from crisis to crisis amid internecine warfare, with even some of Trump’s closest allies expressing contempt for him.

Bannon, who was chief executive of the Trump campaign in its final three months, then White House chief strategist for seven months before returning to the rightwing Breitbart News, is a central figure in the nasty, cutthroat drama, quoted extensively, often in salty language.