大象传媒

Boris Johnson has used his first intervention in the election campaign to mount the Conservatives' most personal attack yet on Jeremy Corbyn.

Writing in The Sun, the foreign secretary accused the Labour leader of being a threat to the UK and described him as a "mutton-headed, old mugwump".

He accused Mr Corbyn of being reluctant to use lethal force, opposing nuclear weapons and campaigning against Nato.

Labour said Mr Johnson was "delusional" and Brexit will hurt the UK's standing.

The Oxford English Dictionary defines a mugwump as someone who remains aloof or independent, especially politically.

However, the Harry Potter books also refer to supreme mugwumps, meaning a group of superior wizards.