Let him quit. This childish 'threat' from him was there few times before also. It is better not to keep a PM who thinks the honourable post is so triffle and irresponsible. Not even an ordinary illiterate person would have ill-treated this honourable post like he did by threatening to quit if he was not supported for his stand on a Deal. There are lot of matured and respectable persons to honourably hold PM's post.