Suspended Labour MP Mike Amesbury has been jailed for 10 weeks after punching a man in the street.
The Runcorn and Helsby MP pleaded guilty in January to assault by beating of 45-year-old Paul Fellows in Main Street, Frodsham, Cheshire, in the early hours of 26 October.
As well as a 10-week jail sentence, Amesbury must pay £200 compensation to Mr Fellows.
His future as an MP remains under question as his lawyer indicated he will appeal the sentence.
Otherwise, MPs who receive a custodial sentence, even if it is suspended, automatically trigger a recall petition which could result in a by-election if 10% of constituents sign it.