Roy Spencer is a satellite observation expert, who has reversed his opinion of satellite measurements, and now believes that warming is about as described by the traditional thermometer datasets.

Judith Curry doesn't disagree with AGW, she disagrees with the scale predicted. That would mean less immediate, strict action, but action nevertheless.

Freeman Dyson isn't a climatologist, he also says himself "[m]y objections to the global warming propaganda are not so much over the technical facts, about which I do not know much, but it’s rather against the way those people behave and the kind of intolerance to criticism that a lot of them have." He also believes in AGW.

It's good to have sceptics, and in particular being sceptical about the scale of AGW is very reasonable. The IPCC predictions actually have a wide variance for these reasons. These scientists don't really speak against the moderate action currently proposed, they aren't backing for Trump's position.