Luke Harding is a Guardian foreign correspondent who has reported from Delhi, Berlin and Moscow and covered wars in Afghanistan, Iraq, and Libya. His last book Collusion: How Russia Helped Trump Win the White House was published in November 2017 and tackles the subject of Russian interference in the 2016 US elections. Collusion was a #1 New York Times best-seller. The Kremlin expelled Harding from Russia in 2011 while working as a reporter in the country. He has written five other books including A Very Expensive Poison, about the murder of Alexander Litvinenko, and Mafia State about his work in Russia as a reporter and becoming an enemy of the Kremlin.