Former Trump adviser Roger Stone vowed during a dramatic press conference outside a federal courthouse in Florida on Friday afternoon to fight the charges of witness tampering, obstruction and false statements brought by Special Counsel Robert Mueller, calling the charges "politically motivated" while insisting he would not turn against President Trump.

"I will plead not guilty to these charges," Stone told reporters, speaking over hecklers. "I will defeat them in court. This is a politically-motivated investigation."

Stone, who once worked for former President Nixon and has a tattoo of the former president on his back, flashed the Nixon V-signs in front of cameras before he spoke.

"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," said Stone, who will appear on "Tucker Carlson Tonight" on Fox News Channel Friday at 8 p.m. ET.

The indictment unsealed Friday does not charge Stone with conspiring with WikiLeaks, the anti-secrecy website that published emails of Democrats during the 2016 campaign, or with the Russian officers Mueller says hacked them. Instead, it accuses him of lying about his interactions related to WikiLeaks' release during probes by Congress and Mueller’s team.

ROGER STONE INDICTED ON SEVERAL CHARGES AS PART OF MUELLER’S RUSSIA COLLUSION PROBE

Still, the indictment raises questions about who Stone – who advised Trump for years but left the campaign in 2015 – spoke with about the hacked emails.

The indictment states that during the summer of 2016, Stone spoke to senior Trump campaign officials about WikiLeaks and information it might have had that would be damaging to Democrat Hillary Clinton’s campaign.

It also said Stone was contacted by senior Trump campaign officials to inquire about future releases, and that Stone continued to communicate with members of the Trump campaign about WikiLeaks.

For months, Stone has warned that he could be indicted, repeatedly denying the accusation he actually had advance knowledge of WikiLeaks releasing hacked emails of Democrats during the 2016 campaign.

Jay Sekulow, a lawyer for Trump, said Friday, "The indictment today does not allege Russian collusion by Roger Stone or anyone else. Rather, the indictment focuses on alleged false statements Mr. Stone made to Congress.”

A spokesman for Mueller’s office said Stone, 66, was arrested in Fort Lauderdale on Friday morning after being indicted by a federal grand jury a day earlier. Video aired by CNN shows numerous FBI agents with guns banging on Stone’s door and demanding that he come outside.

The 24-page indictment alleges that Stone worked to obstruct the House Intelligence Committee’s investigation into Russian interference in the 2016 election by making false statements to the committee, denying he had records sought by the committee and persuading a witness to provide false testimony.

WHO'S BEEN CHARGED BY MUELLER IN THE RUSSIA PROBE SO FAR?

Stone served as an adviser to Trump for years before he ran for president. He left Trump’s campaign in August 2015, but maintained regular contact with and publicly supported the Trump campaign through the 2016 election.

Mueller’s investigation, which was initially ordered to look into the 2016 election, has gone on for more than a year and half. It has expanded to probe financial crimes of Trump associates before the election, conversations Trump’s national security adviser had with the Russians during the transition and whether Trump obstructed justice with his comments and actions related to the probe.

While the indictment provides some new insight into the Trump campaign, it deals largely with what prosecutors say were Stone's false statements about his conversations with conservative writer and conspiracy theorist, Jerome Corsi, and New York radio host, Randy Credico. Corsi is referred to as Person 1 in the indictment, and Credico as Person 2.

The indictment accuses Stone of carrying out a "prolonged effort" to keep Credico from contradicting his testimony before the House intelligence committee. During that effort, prosecutors note that Stone repeatedly told Credico to "do a 'Frank Pentangeli,'" a reference to a character in "The Godfather: Part II" who lies before a congressional committee.

Stone is also accused of threatening Credico. The indictment cites several messages, some of which have already been public, that Stone sent to Credico last year. On April 9, Stone called Credico a "rat" and a "stoolie" and accused him of backstabbing his friends. Stone also threatened to "take that dog away from you," a reference to Credico's dog, Bianca.

"I am so ready. Let's get it on. Prepare to die (expletive)," Stone also wrote to Credico.

The Associated Press contributed to this report.