Mendacity is so fundamental to David Cameron's character that a lie comes as second nature when faced with any difficulty. Take the European Arrest Warrant; it's inequitable, unfair and wholly alien to the British system of law and justice. It's hated by the majority of Tory MPs, civil libertarians and voters with passports. The government now has the chance to opt-out of it - a no-brainer, one would have thought.
Except for reasons known only to himself, Cameron is committed to confirming its application to British subjects by 1st December. Any corrupt, bribe-taking tinpot little magistrate in Greece or Cyprus can then sign a form to have a British subject dragged out of their UK bed, bundled onto an aircraft in manacles and consigned to squalor and the horror of a third-world prison. Why Cameron is so in favour of this defeats me - but he is.
In fact, so committed is he to the measure that he's just lied to give Tory MPs the impression that he's not yet made up his mind. The lie, he hopes, will get them off his back and allow him to agree the measure without further fuss.
Except, I suspect, they are better acquainted with his tendency to mendacity these days and may just not let him get away with it.