Roger Stone, a longtime aide and confidant of President Donald Trump, was arrested early Friday morning by the FBI after being indicted on charges he lied to Congress and obstructed the House Intelligence Committee’s investigation of Russian interference in the 2016 election.

The seven-count indictment alleges Stone misled lawmakers on the committee about his efforts to communicate with WikiLeaks and his contacts with the Trump campaign. It also accuses Stone of attempting to intimidate another witness: radio host Randy Credico, who was in contact with WikiLeaks head Julian Assange in 2016.