Alexander and Queen Máxima of the Netherlands. He was the last of the dozens of heads of state invited to the Paleis Huis ten Bosch in The Hague, the straight-backed footmen in braided gold tailcoats swaying in place by the time he climbed out of his armored limousine.

The leaders reaffirmed their “ironclad commitment” to NATO’s collective defense clause, Article 5. In recent years, Trump had sowed seeds of doubt about whether the U.S. — NATO’s most powerful member — would come to the aid of any ally under attack.

President Donald Trump is attending the NATO summit, and it looks like one member of the Dutch royal family was having a laugh at his expense.