President Donald Trump’s longtime adviser - Roger Stone - was convicted by a federal jury on all seven criminal counts against him.

Friday's verdict found Stone guilty of five counts of lying to Congress, one count of witness tampering and one count of obstructing justice.

Sixty-seven-year-old Stone - a self-described ‘dirty trickster’ with the face of former president Richard Nixon tattooed on his back - had pleaded not guilty to the charges that sprang from Special Counsel Robert Mueller's report on Russian interference in the 2016 election.

In sworn testimony, Stone told the House Intelligence committee in 2017 that he had never communicated with any members of Trump's campaign about WikiLeaks or its founder Julian Assange. WikiLeaks published hacked emails embarrassing to Hillary Clinton's campaign.

Emails that candidate Trump referenced often on the campaign trail.

In closing arguments on Wednesday - prosecutors told jurors that Stone lied to Congress in order to protect Trump's image.

The president Tweeted Friday that Stone’s conviction was evidence of a double standard - and suggested that his many political foes also be charged with lying.

The guilty verdict was announced, Friday, as an impeachment hearing in Congress was underway - with former U.S. ambassador to Ukraine, Marie Yovanovitch, testifying that she felt threatened by Trump, and was pushed out of her post following a smear campaign against her.

Stone now faces a possible decades-long sentence.