A jury convicted U.S. President Donald Trump¡¯s longtime adviser Roger Stone on Friday, finding the Republican operative guilty on seven criminal counts of lying to Congress, obstruction and witness tampering.

The verdict in a trial arising from investigations of Russian interference in the 2016 U.S. election renews scrutiny on Trump¡¯s actions as a candidate at a time when he faces an impeachment inquiry that could derail his presidency.

Stone, a 67-year-old self-described ¡°dirty trickster¡± and ¡°agent provocateur,¡± was charged this year by special counsel Robert Mueller with obstructing justice, witness tampering and lying to the House of Representatives Intelligence Committee during its investigation into Russian election interference.