By FoxNews.com

The head of ATF recently warned employees that they will face "consequences" if they don't "respect the chain of command," in what Republican lawmakers are decrying as an "ominous message" meant to frighten would-be whistle-blowers in the wake of the Operation Fast and Furious scandal.

Sen. Charles Grassley, R-Iowa., and Rep. Darrell Issa, R-Calif., fired off a letter Wednesday to Acting Director B. Todd Jones saying the message "could be interpreted as a threat" and urging him to clarify.

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