London Mayor Boris Johnson "desperately wants to be prime minister", according to Downing Street's former spin doctor Andy Coulson.
Mr Coulson went on: "If proof were needed that our PM is a man untroubled by self doubt, it came in his next sentence - 'so I think he'll be a bloody brilliant candidate for us'.
"Stabbing David, or anyone else for that matter, in the back would be distinctly off brand - just not very Boris. He would much prefer to see David fail miserably in the election and ride in on his bike to save party and country."
More top news
Some showers in the north will be enough to produce hail and thunder but it should be a drier and brighter day in the south and east.
Leonie Granger deliberately targeted Mehmet Hassan, who was robbed and kicked to death by two men she let into his flat.
Pop and soul singer Sam Smith has cancelled the rest of his Australian tour after doctors discovered a haemorrhage on his vocal cords.