On May 16, the House Energy and Commerce Subcommittees on Energy and Power and on Environment and the Economy held a hearing to examine the fiscal year 2014 requested budget for the Environmental Protection Agency. Energy and Power Chairman Ed Whitfield (R-KY) expressed concerns about the high cost of Mercury and Air Toxic Standards and vehicle emissions standards. Energy and Commerce Chairman Fred Upton (R-MI) said the greenhouse gas regulations could constrain fuel diversity. In 2012, the EPA finalized 635 rules. At the hearing, EPA Acting Administrator Bob Perciasepe said the agency is still considering rules for greenhouse gas emissions from new or existing power plants, as it has received almost 2.5 million public comments.