The complaint, filed by the U.S. Attorney's office in Nevada, identified the would-be assassin as Michael Steven Sandford.
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Sandford faces one count of attempting to commit an act of physical violence on restricted grounds.
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Sandford, who has a United Kingdom driver's license, approached a Las Vegas police officer during a rally at the Treasure Island Casino pretending to ask for an autograph, the complaint says.Â
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Authorities charged Sandford with trying to commit an act of violence against a person in a restricted area. He could be sentenced to up to 10 years in prison if convicted.