The United States, for its part, has a law banning visas from being issued to citizens of countries that won’t take back their deportees. Although I don’t know that it’s ever been enforced, and it certainly wouldn’t be enforced against a Country We Like.
This article :-
suggests that the plan was to seize passports from returning Jihadists, and effectively to make them stateless.
Relevant quotation :-
"The government has been examining the possibility of withdrawing citizenship from suspected jihadis returning from Iraq and Syria…
On Tuesday morning, David Anderson, the independent reviewer of terrorism, said there were significant difficulties with giving police the powers to withdraw passports from UK citizens, effectively leaving them stateless"
In any event, according to that article, the proposal has effectively been dropped.
Do you believe the law applies to jihadists?
Yes. All laws, and all restrictions on laws, such as presumption of innocence, apply to all.
The two things are separate, though: removal of passport removes the right to travel to places requiring one (if mine got removed, I’d still be able to travel to most Schengen countries by land even if my national ID was removed as well). Removal of citizenship is a much more extreme measure. If I was abroad and lost my passport I’d be passport-less, but one of the ways in which my nearest consular office would be able to assist me is by providing a new one; if I lost my citizenship they’d tell me to talk with the Marines (there are countries whose citizenship gets lost for things like “not going to the nearest consular office once a year”, so it’s actually possible to lose it without it being judicially removed).
All laws should apply equally to everyone.