Police were forced to intervene with crowds prior to his appearance at the Munk Debates.
The debate will take place on the eve of U.S. midterm elections in November.
Bannon was a founding member of the website's board.
Charles Harder said Bannon broke the terms of a “confidentiality and non-disparagement agreement.”
"Steve is learning that winning isn’t as easy as I make it look."
Canada has sins to atone for, too.
A source close to the ex-Trump chief strategist says Bannon is now "fully unchained."
"We all have relationships with people in the White House."
He was also "born in a petri dish."