Truly, this is a moment as important as it is unusual. History does not provide us a guide here.
Never before have we seen so many world leaders gather at such short notice for a meeting like this at the White House, and with a president as consequential as he is unpredictable.
The speed with which it has been organised is remarkable. A diplomatic source has framed the hasty gathering as “organic”; the obvious next step after the Alaska summit, the source said.
The Europeans were not in the room for that. Today, they will dominate the room.
Is there a risk Donald Trump will feel encircled? More likely, he will enjoy the moment, seeing himself as the great convener. And on that, he’d be right.