Liberal Democrat MP John Hemming has condemned the arrest of a police officer in connection with the Andrew Mitchell 'plebgate' row.
The former chief whip resigned from his post after he was accused of calling police officers 'plebs' outside the gates of Downing Street.
He denies using the word.
It is claimed the police officer leaked false information about the incident to a national newspaper.
A report out today says David Cameron brought in the the wrong person to investigate 'Plebgate'.
Andrew Mitchell has written a piece in which he has accused the police of trying to destroy his career in a smear campaign.
A police officer who claimed to have witnessed Andrew Mitchell's 'rant' at Downing Street is being investigated by the police watchdog.