NPR – President Trump, Canadian Prime Minister Justin Trudeau and Mexican President Enrique Peña Nieto signed the new U.S. Mexico Canada Agreement — or USMCA — in Buenos Aires Friday, writes Ben Chappell for NPR.

The three leaders used the backdrop of the G-20 Summit to resolve a trade dispute between America and its closest neighbors.

“Let’s go,” all three leaders said as they sat alongside each other to sign multiple copies of the deal.

They then shuffled binders around in front of them, to finalize the deal that remakes one of the world’s largest free trade zones. When the signing was over, they paused for a photo-op. “Might as well hold that up,” Trump said, displaying the fresh signatures as the three leaders sat together.

Despite that and other prodding, Trudeau opted not to follow his peers in holding up his binder to celebrate — a sign, perhaps, of the lingering effects of the contentious process that was triggered when Trump imposed tariffs on Mexico and Canada earlier this year, which remain in place.

The signing event and the leaders’ remarks were livestreamed. You can watch the event here.