Assertion of Executive Privilege Over Communications Regarding EPA’s Ozone Air Quality Standards and California’s Greenhouse Gas Waiver Request

The President may lawfully assert executive privilege in response to congressional subpoenas seeking communications within the Executive Office of the President or between the Environmental Protection Agency and the EOP concerning EPA’s promulgation of a regulation revising national ambient air quality standards for ozone or EPA’s decision to deny a petition by California for a waiver from federal preemption to enable it to regulate greenhouse gas emissions from motor vehicles.