The US Constitution is only applicable to US Citizens on US Soil or Abroad that are not acting as enemy agents and all persons on US soil. The US Constitution does not apply to non US persons that are not on US soil.

The Canadian Constitution is applied similarly. A US citizen on Canadian soil is first subject to the laws of Canada -- then the laws of the US as a citizen secondly.

When there is conflict, we are not just talking just open declared war but in hot pursuit of an enemy terrorist agent, the US claims extraterritorial jurisdiction (not legal under international law but who can do anything about it?) If you are an enemy agent to the USA there is no place to hide.

Habeas Corpus is required and recognised by all courts for anyone detained on US soil (territory) only.

Like it or not -- that is the way it is -- deal with it.