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Roger Stone, the colorful former longtime political adviser to President Trump, has been indicted on charges of obstruction, making false statements and witness tampering as part of Special Counsel Robert Mueller's wide-ranging Russia collusion probe.

For months, Stone has warned that he could be indicted, saying in public he believed Mueller was investigating whether he had advance knowledge of WikiLeaks releasing hacked emails of Democrats during the 2016 campaign. Stone has repeatedly denied the accusation.

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.

White House press secretary Sarah Sanders told reporters Friday, "This doesn't have anything to do with the president. It doesn't have anything to do with the White House. Stone, a self-described political dirty trickster who famously has a tattoo of Richard Nixon on his back, will make an initial appearance later Friday before U.S. Magistrate Judge Lurana S. Snow at the federal courthouse in Fort Lauderdale.

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.