> No, I don't think you can since it's entirely possible Trump will simply declare he never backtracked and that he still has doubts or evidence Obama wasn't legitimate. He's repeatedly denied saying things _he is on video or twitter_ saying. He can simply make up any facts whenever he wants because no matter the evidence to the contrary, what he says is true simply because he's said it.

President Obama is on video, audio, Twitter, and just about every other form of media saying things that subsequently were proven false. A brazen example of that is the infamous line, "If you like your plan you can keep your plan." which he knew to be false (and Ezekiel Emanuel, architect of much of the ACA had apparently laughed at as impossible).

I don't mean to single out President Obama as it's really all Presidents, or more generally politicians, that do it. It's not unique to Trump, didn't start with him, nor will it end with him.

All politicians lie, what's seemingly different about Trump is the scope and frequency of those lies, and his refusal to admit he even said them given evidence.

Just the refusal to admit them would be bad enough, but since he's gotten away with it just about every time, it shows a worrying trend of there being no accountability. Combined with the frequency, the problem is just multiplied.

I find a politician that can't seem to be held accountable for his actions and that trades on this for more political power very troubling.