Some of the protests against the G20 turned ugly.
There were violent attacks against police and riots with store windows being smashed and police cars burned.
So far there have been 450 arrests.
Conservative MP Peter Kent said that an attack on Israel would be considered an attack on Canada.
How about the Israelis reciprocate that sentiment and send some of their guys over to show us a trick or two about dealing with violent thugs pretending to be protesters?