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The Environmental Protection Agency isn't backing down despite a watchdog report saying a social media campaign by the agency violated the law and calling it "covert propaganda."

Liz Purchia, acting administrator for the EPA's Office of Public Affairs, wrote Thursday night that a "small but vocal group" is trying to score points against the EPA for promoting the Clean Power Plan. She said the issues raised by the agency's opponents won't keep it from promoting its rules and regulations.

"EPA won't back down from our mission," she wrote. "We stand by our public outreach efforts on both the Clean Water Rule and the Clean Power Plan. Unfortunately, valuable time and resources are being wasted on empty attacks."

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