It’s “highly unlikely” that Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE would be able to renegotiate last year’s Paris climate agreement, the head of the United Nations agency in charge of the pact said.

The comments from Christiana Figueres, executive secretary of the United Nations Framework Convention on Climate Change, came days after Trump said he would renegotiate the deal if elected president to obtain better terms for the United States.

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“As we all know, Donald Trump relishes making very dramatic statements on many issues, so it is not surprising, but it is highly unlikely that that would be possible,” Figueres told reporters Wednesday at an event in Cologne, Germany, according to Reuters.

“An agreement that has been adopted by 195 countries would require 195 countries to agree to any new negotiation,” she said.

The agreement, in which each country volunteered its own measures to limit greenhouse gas emissions, took years to negotiate, and was finalized in December. Countries started to formally sign onto it in April.

Trump, the presumptive Republican presidential nominee, is an outspoken skeptic of the scientific consensus that the climate is changing due mainly to human activity.

Trump said last week that he is “not a big fan” of the Paris deal, and it gives too much to countries like China.

“I will be looking at that very, very seriously, and at a minimum I will be renegotiating those agreements, at a minimum. And at a maximum I may do something else,” he told Reuters.

Figueres is leaving the agency in July, at which point Patricia Espinosa, who was approved last week, will take over. Espinosa, a Mexican diplomat, also said renegotiating the deal isn’t likely.

“It would not be easy for anybody to just say ‘I want to renegotiate this,’ ” she said of Trump’s comments.

Renegotiation “is really not a scenario that in a multilateral process you can see as something feasible,” she added.