No, that's not it, in Canadian Parliament it is the speaker of the house who has ths sole responsibility for both inviting guests to the gallery and for recognizing them in the official remarks. Other members of the house and government weren't even given notice the guy would be there. The speakers office arranges guest vetting, but it is only a security vetting not a political one. That is the PPS and RCMP decide if the 98 year old, legal Canadian immigrant is likely to put the house and guesses physical danger, they don't consider at all if the guest will cause a political headache.

So the fallout is that the speaker (who in fact was solely responsible for what happened) has resigned, and the PM has offerd an official apology on behalf of all Canadians. There could be more political fallout domestically, as the opposition parties are misleading Canadians and stoking ignorance of our procedures to paint the government as responsible , which I emphasize again, they were not.