02/25/2012 05:19 pm ET

Michele Bachmann Threat: Federal Grand Jury Investigating Crude Tweet

A federal grand jury here is investigating a man for allegedly using Twitter to threaten U.S. Rep. Michele Bachmann during her presidential campaign.

U.S. District Judge Royce Lamberth revealed the investigation this week when he ruled against the man's request to quash a grand jury subpoena seeking his identity from Twitter, a social networking site.

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