What makes a President 'presidential'?

Is it tone of voice, is it the right suits, is it saying the right phrases to the right people?

In Presidential, Martin Concagh explores an alternate world through the defining moments of different American Presidents. The influential moments of faces both familiar and unfamiliar to our world; what defined the presidencies sick men, grieving men, angry men and combative men (and women) and how that defined their world. What they did and what they said. How they handled their own scandals and crises and wars in a world that may seem a lot like our own but is subtly different.