Eisenhower. He had both the political skill and organizational smarts, plus having unchallenged integrity.
FDR as a second choice, although I would worry that the world has changed so much that he might not grasp the current situation.
The early Lyndon Johnson third. He had the political savvy, but lost his judgment when he succumbed to his Texas machismo and decided to escalate the Vietnam war on the grounds that the world shouldn’t consider the US a “poor, pitiful helpless giant,” thereby creating exactly that situation.
Actually, I don’t think any of them would be the best pick for our times – Mr. Trump, especially. I’m as old as he is, and it’s obvious that he’s living stuck in times past, kind of like a bug encased in amber. The world has changed incredibly, and you have to admit it before you can deal effectively with it.