In a video now circulating online, DUP politician Ian Paisley Jnr can be seen joining Morrison on stage.
A video of Van Morrison leading a chant against Northern Ireland Health Minister Robin Swann has surfaced online.
This was after the first of a series of concerts from the singer-songwriter was cancelled hours before it was due to take place.
The gigs were set to begin on Thursday and were scheduled to happen over four nights at the Europa Hotel in Belfast.
Though current Covid-19 rules in the North say live music is not permitted in hospitality venues, the hotel group had hoped to have the concerts classed as test events, according to the
BBC.
Instead of performing, Van Morrison took to the stage in the Europa Hotel and said: "Robin Swann says in his interview with Rolling Stone Magazine I was dangerous.
"Okay, well, if I can't affect any change in this situation, right, I don't have any power - or my power is very limited to change this situation - Robin Swann has got all the power. He's keeping us in this for over 15 months.
"All I have to say is, if I don't have any power, my power is like extremely limited if at all, Robin Swann's got all the power. So I'd say Robin Swann is very dangerous."
In the video, Morrison is seen repeating loudly "Robin Swann is very dangerous" and banging his hands on the podium.
He then called Ian Paisley Jnr to join him on stage to repeat the chant with him, before the pair shook hands.
Morrison then said: "This stops when we say no. That's when it stops."
The singer-songwriter has been an outspoken critic of lockdowns throughout the Covid-19 pandemic.
You can watch the video below.
