Keir Starmer resigns: "He's been chewed up and spat out"

This morning, Keir Starmer stood outside No 10 Downing Street and announced his resignation as Prime Minister - the sixth to leave office since the EU referendum, which was ten years ago this week. He will remain in office until Labour selects a new leader.  The Prime Minister's likely successor Andy Burnham is sworn in as an MP today after his decisive victory in the Makerfield by-election last week. Burnham has already announced his intention to stand as a leadership contender. How did the Prime Minister come to this momentous decision, and what happens next? Anoosh Chakelian is joined by political editor Ailbhe Rea and editor-in-chief Tom McTague.