The Government's Chief Whip, Andrew Mitchell has resigned after an altercation with police at Downing Street.
Mr Mitchell has apologised for confronting armed police officers outside Downing Street after allegedly subjecting them to a foul-mouthed tirade last month, but has faced increasing political pressure.
The Tory enforcer has denied calling officers 'plebs', but admitted that he did use foul language.
David Cameron admits it 'became apparent' to the former Chief Whip that he could no longer do his job. So why was it not apparent to the PM?
Government Chief Whip Andrew Mitchell has resigned after swearing at police guarding Downing Street.
Losing one's temper with a police officer would be excusable in most people, but for the Tory chief whip to do means so much more.