Did Donald Trump not want to exert himself any more than necessarily during his exhausting trip, or was it because he was getting along with the other world leaders so poorly on issues like Climate Change (where it’s six to one). 

Whatever the case the symbolism is apt. 

Out of step: G7 leaders take a stroll, Trump takes a golf cart

By Tom Kington Taormina

The distance between Donald Trump and his G7 partners was spelled out dramatically today when Theresa May and the leaders of Italy, France, Germany, Japan and Canada strolled the streets of Taormina, Sicily — while he followed in a golf cart.

The six are planning to put pressure on Mr Trump over his opposition to free trade and efforts to combat climate change. They walked the 700 yards from the traditional G7 group photo, taken at a Greek amphitheatre, to a piazza in the hilltop town, but Mr Trump stayed behind until he could take a seat in the electric vehicle.

He had been the last to arrive for the photo, keeping the others waiting at the amphitheatre,...

 “I mean, can you imagine, we're defending Saudi Arabia? And with all of the money they have, we're defending them, and they're not paying? All you have to do is speak to them. Wait. You have so many different things you have to be able to do, and I don't believe that Hillary has the stamina."
~ Donald Trump

UPDATE:

Well maybe Donald Trump really is exhausted if he is forgoing the ego boosting adulation he craves so often.

Trump cancels Iowa campaign rally