Andrew Jackson. Ask him if his determination that the union be held together at all costs looks like a good idea now. Tough SOB. Not afraid to go to the front of the battle, unlike most presidents since.
Probably the OG G.W. or Sam Adams. I don't think an hour would be enough. I'd ask what he thinks of the Country today. If he would be disappointed in the direction the US is going and how or if he would want to change it. Would he change anything about how they created the Country and what other rights they would have added to the Constitution if any? Lots of questions to ask.
I saw a few teddys...that would be fun....a good 2nd choice. I'm going Reagan. Good ole red blooded American who came from Hollywood and re-shaped politics. Reagan for President!!