What to do about Belhassen Trabelsi. Let's look at it this way.
He has $1000 million.
He's in Quebec and wants to stay in Canada.
Quebec needs $400 million for a new arena.
There's no extradition to Tunisia anyway so perhaps for a strategic goodwill gesture to his new country such as building an arena for the community of Quebec to enjoy he would still have plenty to live well on and spend in Canada.
For all we know he made his money fighting Islamic extremism. Perhaps what happened in Tunisia can stay in Tunisia for all that the great majority of Canadians care. If he wants to be here, stay out of trouble and contribute to the community.