Can NATO force the UK into spending more?

On this episode of 'Tonight with Andrew Marr', Andrew is joined by the former head of the Foreign Office, Lord Simon McDonald and Member of the Defence Select Committee and Labour MP for Plymouth Moor View, Fred Thomas MP to discuss the possibility of NATO forcing the UK into higher defence spending. He is also joined by Former Home Secretary Amber Rudd on migrant channel crossings, as well as actor and star of 'The Deep Blue Sea', Tamsin Greig.