Donald Trump’s former adviser Roger Stone has been found guilty on all seven counts of obstruction, witness tampering and lying to Congress.

The self-proclaimed “dirty trickster” was found guilty of the offences by a jury in Washington on Friday.

A long-time Republican operative and friend of Mr Trump’s, Stone was an adviser to the then-candidate during his 2016 presidential election campaign.

He is the sixth Trump aide or adviser to be convicted of charges brought as part of special counsel Robert Mueller’s investigation into Russian interference of the election.

His trial in a federal court arose from that investigation and damaging WikiLeaks emails, hacked by Russia, about then-Democratic presidential nominee Hillary Clinton.

Stone, 67, denied any wrongdoing and constantly claimed the case against him was politically motivated.

He did not take to the stand during the trial and showed no visible reaction as the verdict was read aloud, count by count.

Stone is scheduled to be sentenced on 6 February and faces up to 20 years in prison.

His conviction renews scrutiny on Mr Trump’s activities on the second day an impeachment inquiry into the president was broadcast to the public.

Minutes after the verdict, Mr Trump tweeted that the conviction was “a double standard like never seen before in the history of our country” because his enemies, including Mrs. Clinton, former FBI director James Comey and “even Mueller himself”, have not been convicted.

“Didn’t they lie?” he said.

Stone was charged earlier this year with obstructing justice, witness tampering and lying to the US House of Representatives intelligence committee during its investigation into Russian interference.

His trial in Washington was a colorful affair which featured multiple references to The Godfather Part III film, a Bernie

Sanders impression and testimony by political heavyweights including former Trump campaign CEO Steve Bannon and former Trump campaign deputy Rick Gates.

They both told the trial they believed Stone had inside information about when WikiLeaks might release more harmful emails about Mrs Clinton.

Prosecutors accused Stone of telling Representatives five different lies about WikiLeaks and its founder Julian Assange after the emails were released in 2016.

US intelligence officials and Special Counsel Robert Mueller later concluded the emails had been stolen by Russian hackers.

Some of the lies were about the existence of certain texts or emails, while others were about Stone’s conversations with Trump campaign officials and a supposed “intermediary” with WikiLeaks in early August 2016 who Stone identified to House Representatives as being comedian Randy Credico.