Environmental Protection Agency

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Environmental Protection Agency Administrator Gina McCarthy called for the inspector general to "temporarily halt" a probe after an investigator reported threatening behavior from an official inside the homeland security office, documents show. (Associated Press)

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FILE - This July 1, 2013 file photo shows smoke rises from the Colstrip Steam Electric Station, a coal burning power plant in in Colstrip, Mont. The Supreme Court on Tuesday handed the Obama administration an important victory in its effort to reduce power plant pollution that contributes to unhealthy air in neighboring states. In a 6-2 decision, the court upheld a rule adopted by the Environmental Protection Agency in 2011 to limit emissions from plants in more than two-dozen Midwestern and Southern states. The pollution drifts into the air above states along the East Coast, and the EPA has long struggled to devise a way to control it. (AP Photo/Matthew Brown, File)

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Illustration on the EPA attack on coal by Alexander Hunter/The Washington Times

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EPA Administrator Lisa Jackson.

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Alaska Gov. Sean Parnell ordered an investigation into the EPA's 'raid' on family-run gold mining businesses. The EPA stood by it's actions, saying its investigations were done 'courteously.' (Associated press)

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**FILE** Gina McCarthy, administrator of the Environmental Protection Agency, holds a climate change report as she speaks at a climate workshop sponsored by The Climate Center at Georgetown University, Thursday, Feb. 21, 2013 in Washington. (AP Photo/Alex Brandon)

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** FILE ** In this Feb. 28, 2014, file photo, EPA Administrator Gina McCarthy discusses proposed regulations with coal industry leaders at Dakota Gasification Synfuels Plant in Beulah, N.D. (AP Photo/Kevin Cederstrom, file)

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FILE - This Feb. 28, 2014 file photo shows EPA Administrator Gina McCarthy speaking in Beulah, N.D. The Obama administration is moving forward with a dramatic reduction in sulfur in gasoline and tighter emissions standards for cars, arguing the move will eventually save thousands of lives per year. The oil and gas industry warns the Environmental Protection Agency rules are unnecessary and will drive up gas prices. The rules will also add to the cost of buying a car. (AP Photo/Kevin Cederstrom, File)

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This Feb. 24, 2014 photo shows the Waste Isolation Pilot Plant in Carlsbad, N.M. Officials held a news conference to discuss preliminary test results that indicate 13 workers worker were exposed to radiation during a leak Feb. 14, 2014, from the nation's first underground nuclear waste dump. New Mexico Sen. Tom Udall says he will ask the Environmental Protection Agency to send air monitors to southeastern New Mexico following a radiation release from the federal government’s underground nuclear waste dump near Carlsbad. Udall says he will send a letter Thursday requesting the portable monitors. Udall says the health and safety of the community and workers at the Waste Isolation Pilot Plant are his top priority. The EPA has regulatory authority over the site and any airborne radiation releases. (AP Photo/Jeri Clausing)