Congress enacted a statute establishing a program to protect areas in the United States that are rich in biological diversity. The program is consistent with the terms of an environmental treaty that the President objected to and did not sign. The statute creates an executive agency and authorizes it to designate parts of federal lands for inclusion in the program in accordance with criteria taken from the treaty. In an inseverable provision, the statute further provides that the agency must report each designation to a committee of Congress and that the committee may overturn the agency's designation by a majority vote. Why is the statute uncon