Impact of a chief of staff's exit

Downing Street is in turmoil as Sir Keir Starmer fights for his political life. Can he cling on to power?

Niall is joined by Lord Barwell, Theresa May’s chief of staff during her time in Downing Street.

He says watching current events play out is like post-traumatic stress disorder.

So, what actually goes on inside Downing Street during a time of crisis? And is there anything the prime minister can do to save his job?

Producers: Tom Gillespie and Paul Wilkinson