The Environmental Protection Agency broke the law by using social media to promote the Waters of the United States regulation, according to a government watchdog.

The Government Accountability Office made the accusation in a letter sent to Sen. James Inhofe, R-Okla., Monday afternoon. The investigators ruled that the use of Thunderclap, a "crowdspeaking platform" that helps a single message be shared across multiple social media platforms at once, was "covert propaganda."

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