Five things we learned from Dominic Cummings' 'bombshell' BBC interview. Picture: BBC Former Downing Street aide Dominic Cummings has spoken out about his time in Government during a 'bombshell' interview with the BBC's Laura Kuenssberg. Mr Cummings, who left No 10 in autumn 2020 after a power struggle, accused Mr Johnson of not having a plan and said he “doesn’t know how to be Prime Minister”. The hour-long interview aired on BBC Two on Tuesday night (July 20). Here's five things we learned from interview. 1) Cummings 'looked into' replacing Boris Johnson Mr Cummings said he was looking to oust Boris Johnson as Prime Minister only weeks after helping him secure an 80-seat majority.