Stone's lawyer Robert Buschel entered the plea at the US District Court for the District of Columbia in response to the charges, which include lying to Congress and witness tampering, the outlet reported.
Trump's former informal political advisor, Roger Stone, was indicted on Friday on charges of witness tampering, obstruction of justice, and lying to Congress. The charges were brought by Special Counsel Mueller, who alleges that Stone sought potentially damaging information about Hillary Clinton from WikiLeaks in coordination with the Trump campaign.
Commenting on the indictment, US President Donald Trump accused the US mainstream media of biased reporting and questioned why Hillary Clinton hadn't been indicted.