United Nations Secretary General António Guterres said he is cooperating with President Donald Trump’s “Board of Peace,” though he called the initiative a “personal project” of the president with a limited role to play in global affairs.

In an interview with Politico, Guterres, whose term as secretary general expires at the end of this year, said he was aligned with the Board’s aim or rebuilding infrastructure in Gaza and said that the U.N. was “cooperating actively with structures created by the Board of Peace.”

But Guterres questioned the broader ambitions of the organization, which Trump described as an alternative to the U.N. and other multilateral organizations, saying it could “prove to be the most consequential international body in history” and Trump declaring himself chairman for life.

Guterres, for example, said the organization had no role in active crisis situations like the one in the Strait of Hormuz shipping lanes threatened by Iran. 

Membership in the Board of Peace requires a $1 billion contribution. Most major western democracies, including Australia, France, Germany, Italy, Japan, and the U.K. have stayed away, and Trump withdrew the invitation to join for Canada after a public spat with Canadian Prime Minister Mark Carney. China and Russia have also declined to join.

The membership roll does include at least 27 nations, including energy powers Saudia Arabia and the United Arab Emirates; top U.S. Middle East ally Israel; Asian countries Indonesia and Vietnam; Armenia and Azerbaijan in Central Asia; European countries Hungary, Bulgaria, and Albania; and Argentina in Latin America.