Former British Prime Minister David Cameron criticized Boris Johnson in a recent interview, accusing the current prime minister of behaving “appallingly” during the Brexit campaign that effectively ended Cameron’s time in office.

Cameron granted a rare interview to The Times in the run-up to the release of his new memoir, For the Record. Cameron has all but disappeared from public life after he resigned from office in 2016 following an unsuccessful campaign to convince British voters to stay in the European Union.