The Clinton campaign mocked Donald Trump Wednesday for his handling of an in-person meeting with Mexican President Enrique Pena Nieto in Mexico City, and suggested the GOP nominee doesn't have what it takes to deal with world leaders.

"Trump just failed his first foreign test. Diplomacy isn't as easy as it looks," Clinton, who served as secretary of state for four years, said on social media.

Trump and Pena Nieto started their meet-up Wednesday with a private discussion that was closed off to the travelling American press. Later, Trump and Pena Nieto participated in a joint press conference in which they laid out their respective positions on trade on immigration.

After delivering their prepared remarks, the Republican candidate and Mexican president took questions from the press. In response to one specific question, Trump said he and Pena Nieto did not discuss the GOP nominee's oft-repeated promise to build a wall on America's southern border and make Mexico pay for it.

Clinton's campaign manager pounced, and mocked Trump for failing to secure a deal on his number one campaign issue.

"Donald Trump has made his outlandish policy of forcing Mexico to pay for his giant wall the centerpiece of his campaign," John Podesta said in a statement. "But at the first opportunity to make good on his offensive campaign promises, Trump choked."

"What we saw today from a man who claims to be the ultimate 'deal maker' is that he doesn't have the courage to advocate for his campaign promises when he's not in front of a friendly crowd. We know who he is," he said.

However, shortly after Podesta's comments circulated in newsrooms, Pena Nieto's own team released a statement alleging that the Mexican president had stated unequivocally in his private meeting with Trump that Mexico would never pay for the border wall.

The Trump campaign hasn't quite disputed this claim, and said in its own a statement that a "negotiation" would have been "inappropriate."

"[W]e look forward to continue the conversation," the Trump campaign said.

Podesta saw this non-denial as yet another opportunity to troll the Republican candidate, and said in another statement, "It turns out Trump didn't choke, he got beat in the room and lied about it."

Clinton's campaign manager added elsewhere on social media, "Turns out running the Miss Universe contest in Russia wasn't good training for international diplomacy."