France, Germany and Italy: Paris deal ‘cannot be renegotiated’ Trump said he would renegotiate the deal ‘on terms that are fair to the US.’

France, Germany and Italy have no intention of renegotiating the Paris climate agreement, their leaders said Thursday in response to U.S. President Donald Trump's announcement that he intends to withdraw and wants to broker another deal.

"We deem the momentum generated in Paris in December 2015 irreversible, and we firmly believe that the Paris agreement cannot be renegotiated since it is a vital instrument for our planet, societies and economies," French President Emmanuel Macron, German Chancellor Angela Merkel and Italian Prime Minister Paolo Gentiloni said in a joint statement.

"The Paris agreement remains a cornerstone in the cooperation between our countries, for effectively and timely tackling climate change," the leaders said. They added that it offers "substantial economic opportunities for prosperity and growth" and that they will step up support for developing countries.

Trump and Macron spoke on the phone Thursday for about five minutes in a "direct" exchange, according to a French presidential source. Macron told Trump that the Paris accord could not be renegotiated. He said France would continue working with the United States but not on the subject of climate change, the source said.

"I respect this sovereign decision but I regret it, and I think he made a mistake for his country's and his people’s interest, for the planet," Macron said in a live televised address late Thursday. "I just talked to President Trump and told him so."

Macron said, without elaborating, that he and Merkel "will in the coming days take strong initiatives," and he will call on every other country in the accord to stick to its terms.

Trump said he would renegotiate the deal "on terms that are fair to the U.S."

“We’re getting out," Trump said, "but we will start to negotiate and we’ll see if we can make a deal that’s fair. If we can, that’s great. If we can’t, that’s fine.”

Later in his address, speaking in English, Macron said "We all share our responsibility: Make our planet great again.”

The United Nations climate change secretariat said that the Paris deal “cannot be renegotiated based on the request of a single party.” Still, it said that "it stands ready to engage in dialog with the United States government regarding the implications of this announcement.”

The chair of the Alliance of Small Island States said because of the design of the Paris accord, it's America's prerogative to change its contribution.

"Renegotiating the entire agreement, however, is not practical and could be a setback from which we never recover,” said Thoriq Ibrahim, from the Maldives.

Nicholas Vinocur contributed reporting from Paris and Marion Solletty contributed reporting from Brussels.