The New York Times recently posted a 2016 podcast interview of a returning Canadian ISIS fighter, known as Abu Huzaifa, who confessed to committing an execution-style murder while in Syria, which he now unconvincingly denies. He is believed to be living in Toronto and he is apparently known to the authorities. The Conservative opposition is in an uproar over these revelations, as they would have preferred that re-entry be denied to such individuals in the first place, as is the case in the UK.
One may reasonably conclude that in spite of the permitted re-entry of ISIS fighters, our national security forces are on top of it, and that Huzaifa, and those like him, will simply have to face justice here at home. The trouble, however, is that such an outcome is highly unlikely. Building a case on events that occurred a few years ago in a foreign war-torn country is extremely difficult, something the Trudeau government undoubtedly realizes.