"Unfortunately I will not be able to perform in front of sold out crowds in Montreal & Toronto. The good people of the Canadian government wouldn't allow me entry. I'll be back this summer and will hopefully see all my Canadian fans!"Chris was scheduled to perform in Montreal and Toronto. And fans had already bought tickets. Die hard Chris Brown fans are now asking the US govt to ban Justin Bieber - who is Canadian - from entry into the US. According to TMZ, Canadian law dictates a person could be "criminally inadmissible" if they have been convicted of a crime involving assault.