Mexican President Felipe Calderon says the legalization of marijuana for recreational use in two U.S. states limits that country’s “moral authority” to ask other nations to combat or restrict illegal drug trafficking.

Calderon says the legalization of marijuana in Washington and Colorado represents a fundamental change that requires the rethinking of public policy in the entire Western Hemisphere.

Calderon spoke in an interview with the newspaper Milenio that was published Tuesday.

Calderon was joined on Monday by leaders of Belize, Honduras and Costa Rica in calling for the Organization of American States to study the impact of the new laws and saying the United Nations’ General Assembly should hold a special session on the prohibition of drugs by 2015 at the latest.