Foreign Office minister Nigel Adams was filmed telling a Brexit protestor to "f*** off" in the street outside Parliament.
Activist Steve Bray, known as 'Stop Brexit Man' had approached Mr Adams in a bid to question the social care tax and "hold (Mr Adams) to account".
Mr Bray was filmed walking behind the minister and asking: "What about dressing this Brexit tax up as tax for social care.
"Do you really believe people believe that nonsense?"
Mr Adams responded: "Who are you filming now Dave?", with the protestor responding, "Dave? My name's not Dave. That's what the far right call me, you must be reading their stuff."
The minister interrupted Mr Bray telling the person filming to stop.
Turning to Mr Bray, the minister said: "I'm really not interested in talking to a odd bloke with a top hat on -".
"Why don't you talk to your MP and f*** off. You're getting on my nerves."
He then appeared to threaten the person filming, adding: "Keep filming as well."
The protestor from South Wales is known for turning up at Parliament every day to shout "Stop Brexit " outside its walls.
As Minister of State for Asia, Mr Adams' job description requires him to be diplomatic.
Mr Bray later told Steve Bray he swore at him "because you're annoying".
In a statement, a spokesperson for Selby and Ainsty MP Mr Adams said: "Mr Bray has spent the last few years harassing, following and hurling abuse at elected Parliamentarians as well as interrupting journalists, preventing some from doing their job of reporting the news and conducting interviews.
"Mr Adams' remarks no doubt reflect those of many democratic representatives trying to deliver on the will of the people and others seeking to go about their business who have been harassed or had their work disrupted by this individual and his handful of followers."
The Tories are set to The Police, Crime and Sentencing Bill contains a string of measures to toughen up the police response after Extinction Rebellion and Black Lives Matters protests were accused of disrupting public life.
