Home secretary Theresa May is a far better candidate than the high-profile pair of George Osborne or Boris Johnson to be the next prime minister, Labour's Andy Burnham has told talkRADIO.
Current PM David Cameron has already said he does not intend to run for re-election at the end of his second term in 2020, and there is a suggestion that he will be forced to resign if the UK votes to leave the European Union on 23 June.
May, who has served in the Cabinet since May 2010, has been put forward as a potential candidate to succeed Cameron, and when asked to choose between her, chancellor George Osborne and former London mayor Boris Johnson, Burnham vouched for the MP for Maidenhead and former Tory party chair.
"I've got more than a grudging respect for Theresa May," the shadow home secretary told Paul Ross.
"I think that in the work I've done with her over Hillsborough, she's proven herself to me as somebody with integrity.
"Out of that bunch, she definitely stands out."