French President Emmanuel Macron pulled a diplomatic ambush on President Donald Trump Saturday, infuriating he president’s aides.

Macron was waiting for Trump when he arrived at the Hotel du Palais in the French resort town of Biarritz, France and maneuvered him into a surprise lunch on the patio ahead of the formal start of the G-7 summit of world leaders.

It was a dramatic departure from the summit’s traditionally careful choreography.

“They’re trying to fracture the G-7,” a senior administration official told Politico, complaining that Macron, as the summit’s host, was attempting to leverage the gathering for his own political benefit.

But a French official said Macron had succeeded in clearing the air with Trump on some of the issues that have brought the two leaders into conflict — including climate change, which Macron has placed at the top of the summit’s agenda.

Still, the G-7, coming hours after Trump announced new tariffs on China, is expected to be acrimonious.

Multiple disagreements among the leaders of the world’s wealthiest democracies – over Brexit, tariffs, trade barriers, NATO contributions, the Iran nuclear accord, and more – threaten to rock the formal meetings on Sunday and Monday.

“This may be the last moment to restore our political community,” a grim European Council President Donald Tusk said Saturday.

Tusk said the European Union would retaliate against U.S. trade if Trump followed through on his vow to impose a tariff on imports of French wine as punishment for Macron’s new digital tax law, which would hit American tech giants like Amazon, Facebook, and Google hard.

“The EU stands by France,” Tusk said. “If the U.S. imposes tariffs on France, the EU will respond in kind.”

At Saturday’s lunch, Trump was noncommittal on the tariff question.

“I love French wine,” the teetotaling president said.

But closer to home, Tusk has a headache of his own to deal with: the continuing impasse over Great Britain’s imminent withdrawal from the European Union.

Boris Johnson, Britain’s new prime minister, intends to pull up stakes on Oct. 31, even if a separation deal is not in place.

Johnson hopes to wrangle a trade deal with the U.S. to ease the separation — yet another G-7 sticking point.

But Johnson, who is set to meet Trump one-on-one Sunday to hammer out that plan, said he will also chide the president about his escalating trade war with China.

“I am very worried about the way it’s going, the growth of protectionism, of tariffs that we’re seeing,” Johnson told reporters Saturday.

“This is not the way to proceed…. I want to see an opening up of global trade, I want to see a dialing down of tensions and I want to see tariffs come off.”

Trump and his wife, First Lady Melania Trump, were all smiles as they joined Macron and the other leaders for the summit’s first official event, a dinner at the Phare de Biarritz, a mid-19th century lighthouse perched high above the coastline.

Five miles away, in Bayonne, French police fired tear gas and water cannons at crowds of demonstrators that included environmental activists, Yellow Vest protesters, and Basque separatists.