The Carbon Brief has interviewed Richard Muller. It's a wideranging piece with much of interest, not least Muller's confirmation that he was never a global warming sceptic.
Asked if it's really accurate to say he was ever a skeptic, Muller replies: "I have considered myself only to be a properly skeptical scientist. Some people have called me a denier - no, that's completely wrong. If anything, I was agnostic.
There is also Muller's reaction to McKitrick's revelation that he had found errors in the BEST papers:
Muller is sanguine: "There were no mistakes in that paper. McKitrick had comments and found things he thought were mistakes, but we wrote back to him and told him he was wrong." He adds: "I think the conclusion that urban heat islands contribute essentially zero to the warming we see is on very solid ground." Indeed, due to BEST and studies that went before it, Muller says that the question of whether urban heating skews warming data is no longer a legitimate quibble with data that shows warming.