Britons who join so-called Islamic State should not be allowed back to UK, Defence Secretary Gavin Williamson says.

Amazing that it is even being discussed.
From FaceBook.

I'm about as liberal as it comes. But this sounds like basic common sense.
If, as an American citizen, I leave The United States to join a force that wants to bring about the down fall of America, I should immediately lose my citizenship and never be allowed back into the country.
There shouldn't even be a debate about this.