Roger Stone appears to think Donald Trump’s presidency is facing grave danger from the special counsel Robert Mueller.

Stone in an interview on Tuesday said Mueller’s investigation into Russian election interference is a “speeding bullet heading for” Trump’s head.

Acting Attorney General Matthew Whitaker earlier this week suggested Mueller’s investigation, which is also examining allegations of collusion between the Kremlin and the Trump campaign, is coming to a close.

Stone was indicted and arrested as part of Mueller’s probe last week and pleaded not guilty on Tuesday to seven counts of obstruction, false statements, and witness tampering.

Roger Stone, a former informal adviser to the Trump campaign and longtime GOP strategist, appeared to issue a dire warning on Tuesday to President Donald Trump about the special counsel Robert Mueller’s investigation into Russian election interference.

In a SiriusXM radio interview with Breitbart News Daily, Stone described Mueller’s probe as a “speeding bullet heading for” Trump’s head.

Stone’s comments come less than a week after he was indicted by Mueller on multiple counts related to his communications with and statements about WikiLeaks, a controversial pro-transparency nonprofit led by Julian Assange that is known for leaks of sensitive information, during the 2016 election. He was arrested at his Florida home last Friday in an FBI raid, which was caught on camera by CNN.

Read more: Roger Stone pleads not guilty to 7 counts of obstruction, false statements, and witness tampering

Among other charges, Stone is accused of lying to Congress about the nature of his communications with WikiLeaks in relation to its infamous dump of Democratic National Committee emails stolen by Russian hackers. The hacks and subsequent document dumps were later determined to be part of a coordinated Kremlin effort to tip the election in Trump’s favor.

On Tuesday, Stone pleaded not guilty to seven counts of obstruction, false statements, and witness tampering.

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Read more: Roger Stone says he’d be open to talking about his conversations with Trump, and that could be a game changer for Mueller

The eccentric GOP strategist’s remarks to Breitbart also came a day after acting Attorney General Matthew Whitaker signaled Mueller’s investigation is coming to a close.

“Right now the investigation is, I think, close to being completed,” Whitaker said on Monday. “And, I hope that we can get the report from director Mueller as soon as possible.”

As part of his investigation, Mueller has looked into allegations of collusion between the Trump campaign and Russia. The US intelligence community concluded Russia interfered in the 2016 election to help Trump, but there is no definitive evidence of collusion at this time, and the president vehemently denies working with the Kremlin. Trump routinely refers to Mueller’s probe as a “witch hunt.”

Stone is just the latest example of someone with close ties to Trump getting caught up in Mueller’s probe, which has now seen 34 people indicted or plead guilty, including Trump’s former personal attorney and longtime fixer Michael Cohen and his former campaign chairman Paul Manafort.