"Capt.Mooron" wrote
What are your views on the USA apprehending a lawful Canadian Citizen,
enroute to a destination outside your country,....

Well, since he was Canadian, he was surely up to no good so arresting him
must have been justified, eh?

Seriously, you provide too little info to form any opinion in this case. If
he was apprehended in Afghanistan in local civilian garb shooting at
Americans, like that guy from Oz, then I'd say his detention was justified.
And, if he had been arrested and convicted in Syria then loaned to us for
questioning I'd say it was right to return him. Otherwise ???