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Boris Johnson has resigned as foreign secretary, throwing the Government into further turmoil after the departure of David Davis as Brexit secretary.

Boris Johnson's close friend and parliamentary aide Conor Burns tells Radio 4's PM programme that "it had been a very difficult decision for him" and "he simply felt he could not defend the position that the Cabinet were bounced into on Friday" at the Chequers summit.

(Photo: Former foreign secretary Boris Johnson. Credit: Getty images)