there are laws against aiding a terrorist group, and anybody trying to enter canada after joining isis should be charged under them.
further, if the existing laws do not have the proper strength or jurisdiction to land anybody trying to enter the country in jail, they should be altered so that they do.
i've been clear that i would like to limit the amount of support we provide to refugees, or at least subject them to the same criteria we have for immigrants. we can argue over that. but, i don't think that arguing over whether we should provide a safe-haven for terrorists is in the realm of reasonable discourse.
i simply don't see any argument for tolerance on this point.