Steven Bonnar and an unidentified neighbour clashed over a Celtic Football Club flag in the window of the MP’s home in Uddingston, South Lanarkshire.
During the row, which was caught on video and uploaded to YouTube, the two men challenged each other to a fight.
Mr Bonnar was asked by the neighbour in relation to the flag: “Is that necessary?”
The MP is then seen crossing the street to repeatedly ask his neighbour: “Is what necessary?”
The Coatbridge, Chryston and Bellshill MP then further asks: “What’s it got to do with you what’s in my house?”
He is repeatedly referred to as a councillor, to which he replies “I’m not a councillor, I’m an MP.”
The MP can then be heard in the footage referring to his neighbour as a “headcase”.
He is then heard saying he would fight the man “any f****** time”.
In a statement on Sunday, Mr Bonnar apologised, whil adding he had been “drawn into” the argument.
He said: “I regret being drawn into a dispute with a neighbour and reacting hastily to comments made.
“I apologise for my language and behaviour, and for any upset caused.”
Mr Bonnar caused controversy last year after he crossed his fingers during the official swearing in of MPs in the House of Commons.
