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.