FBI agents arrested longtime Trump associate Roger Stone in a paramilitary-style raid at his home in Fort Lauderdale, Fla., early Friday morning. A CNN producer on the scene said the arrest involved “heavy weaponry.” Stone was taken into custody without incident.

The arrest followed action by a grand jury in Washington, D.C., under Trump-Russia special counsel Robert Mueller. On Thursday, the grand jury indicted Stone on seven counts of lying to Congress, witness tampering, and obstructing a congressional investigation. So what, specifically, is Stone charged with doing?

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