WASHINGTON — Roger J. Stone Jr., a longtime adviser to President Trump, will appear on Tuesday in a Washington courtroom after being charged last week with obstruction of justice, witness tampering and making false statements.
He has said he will plead not guilty to the charges, brought as part of the special counsel’s investigation into Russian interference in the 2016 election.
In a detailed indictment unsealed on Friday, the special counsel, Robert S. Mueller III, accused Mr. Stone of lying to investigators for the House Intelligence Committee, which is conducting its own inquiry into the Russian campaign, and of pressuring another witness in that investigation to lie to the committee.
Mr. Stone will appear before Judge Amy Berman Jackson, the same judge who has been handling the case against Paul Manafort, the former Trump campaign chairman who pleaded guilty last year to conspiracy charges.
Hours after the F.B.I. conducted a raid on his Florida home early Friday morning, Mr. Stone stood on the steps of a courthouse in Fort Lauderdale and pronounced that he would be “completely vindicated.”
“There is no circumstance whatsoever under which I will bear false witness against the president, nor will I make up lies to ease the pressure on myself,” he said, before flashing twin V-for-victory hand signs made famous by his political hero, former President Richard M. Nixon.
Mr. Stone has gone on a media blitz since then, giving numerous interviews over the weekend about his case and accusing Mr. Mueller’s investigators of hounding him and his associates.
He said that the messages cited in the indictment that he exchanged with Randy Credico, a longtime New York radio personality who was also called to testify before the House Intelligence Committee, were made in jest and taken “out of context.”
“I never told Mr. Credico to lie,” he said on Sunday during an interview on ABC’s “This Week.”
The indictment said that Trump campaign officials dispatched Mr. Stone to make contact with WikiLeaks during the summer of 2016, when the website was releasing a trove of damaging information about Hillary Clinton that had been stolen by Russian intelligence operatives.
Mr. Mueller has not accused Mr. Stone of playing a role in the hacking, and Mr. Trump and his allies have pointed out that the indictment does not make a case that the Trump campaign engaged in a conspiracy with Russia to disrupt the election.