My message to the Prime Minister and the Home Secretary is this: don't play games on national security. It's far too serious for that. Keep the security cooperation debate and deal separate. Make clear you won't ever use life saving security information as a bargaining chip, you won't ever withhold security cooperation for the sake of a trade deal and you won't ever undermine our national security in the way the Government suggested on Wednesday. And be clear on this; getting no deal on security would be disastrous for all of us, and the Prime Minister should not even threaten to walk away from the table without a security deal.