isn't too difficult to make that isis deserves to be struck but what's the biggest plan? that's the criticism of the iraq war. not just that they took part in the conflict but it wasn't thought out. particularly, the aftermath. what david cameron tried to do today is explain to the politicians, the british public, what he sees as the wider strategy in not just dealing with isis but syria as well. >> he has said the united kingdom cannot, quote, subcontract its security to other countries. thank you very much. phil black live for us in london. let's speak with stefan devries who's been with us throughout our coverage of the paris attacks. cameron says he will not call a parliamentary vote unless he'll have a clear majority of strikes in syria because he he says we will not hand a pr coup to isis. does that argument have merit,