A prominent U.K. politician advocated for the killing of British nationals who have joined the Islamic State, arguing they pose such a danger it may be the only option.

Rory Stewart, a minister in the Foreign Office and former Member of Parliament, shared his views on the threat faced by the U.K. and Europe as the Islamic State’s so-called caliphate comes apart in Iraq and Syria.

“They believe in an extremely hateful doctrine which involves killing themselves, killing others and trying to use violence and brutality to create an eighth century, or seventh century, state.”

“I’m afraid we have to be serious about the fact these people are a serious danger to us, and unfortunately the only way of dealing with them will be, in almost every case, to kill them.”