(NBC News) Former Trump campaign adviser Roger Stone pleaded not guilty Tuesday to seven counts including lying to Congress, obstruction and witness tampering.
Stone was indicted as part of special counsel Robert Mueller's Russia probe.
In the indictment, prosecutors say a high-ranking Trump campaign official directed Stone to seek out emails damaging to Hillary Clinton, emails they believe Russia hacked. Wikileaks later made those emails made public, and Stone received a text from another Trump official saying "well done."
Stone made no comments as he departed from the federal courthouse in Washington, D.C., but has repeatedly denied collusion with Russia or any collaboration with Wikileaks.
He is the sixth Trump associate charged in special counsel Mueller's Russia investigation.