Britain may have to "revisit" its position on Iraq if the threat to national security becomes too much.
Former Army officer Col Bob Stewart MP told ITV News: "Things happen and circumstances change, and if our country is threatened by people from the Islamic State, our national interest, our people are threatened, we may well have to revisit that situation."
ITV's Deputy Political Editor Chris Ship reports:
More top news
Two Air France directors had the shirts ripped off their backs by angry employees after the company announced loss of 2900 jobs.
Ched Evans' rape conviction has been referred to the Court of Appeal by the Criminal Cases Review Commission has announced.
A coroner's document seen by ITV News calls on the holiday industry and government to act to prevent a repeat of two children's deaths.