Over two dozen Republican attorneys general are challenging a proposed rule from the New York Stock Exchange that they say would illegally implement a radical environmentalist agenda and harm national security.

The rule from the NYSE would create a listing entity called a Natural Asset Company (NAC), which would be empowered to control private and public lands by capturing “the intrinsic and productive value of nature” and block things like logging, herding, and drilling from happening on the land. The Securities and Exchange Commission is considering the proposal to approve NACs and is taking public comment until January 18.

“If it approves the NYSE’s proposal, the Commission will have effectively enabled the NYSE, the most well-known and influential stock exchange on earth,  to authorize the existence of entities that could ultimately be used to subordinate the interests of millions of Americans to the aims of environmental activists as well as to United Nations policies and mandates,” a Tuesday letter from 25 Republican attorneys general led by Utah AG Sean Reyes and Kansas AG Kris Kobach said.