Roger Stone: 'Very dangerous' for Trump to interview with Mueller

Former informal Trump adviser Roger StoneRoger Jason StoneHillicon Valley: Omarosa drops bombshell claim about Trump, WikiLeaks | Dems turn up heat over fake FCC cyberattack | Uber hires ex-NSA official to improve security | FBI boosts cyber team Omarosa claims Trump knew about hacked emails prior to WikiLeaks release Roger Stone shares image of himself and Trump as ‘Space Force’ wearing swastikas MORE said Friday that he thinks it would be a mistake for President TrumpDonald John TrumpNFL players stand in tunnel during anthem, extending protests 12 former top intel officials blast Trump's move to revoke Brennan's security clearance NYT: Omarosa believed to have as many as 200 tapes MORE to sit down for an interview with special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE.

During a CNN interview, Stone warned of a potential "perjury trap" for the president, saying Mueller could probe "some process-related crime that doesn't relate to Russia."

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"I obviously believe the special counsel has a political bias, as demonstrated by the FBI text messages and emails that have surfaced and the political nature of this investigation, so I think it is very dangerous for the president to do so," Stone said.

His advice to Trump came just hours after a CNN report that Trump was in the preliminary stages of preparing for a possible interview with Mueller later this year.

The president has not formally agreed to sit down with the special counsel, but has said in the past that he "would like to." His former attorney, John Dowd, resigned last month after advising Trump against such a move.

Nineteen people, including several former members of the Trump campaign, have so far been hit with criminal charges stemming from the special counsel investigation into Russia's interference in the 2016 election, including possible collusion.

Trump's former campaign chairman, Paul ManafortPaul John ManafortDem: Trump pardoning Manafort would be grounds for impeachment Manafort jury ends first day with questions, including definition of 'reasonable doubt' Mueller should indict Trump for obstruction before the midterms MORE, is battling charges of money laundering and tax fraud while former campaign advisers Michael Flynn and George PapadopoulosGeorge Demetrios PapadopoulosPapadopoulos's wife wants him to scrap plea deal with Mueller: report Fox News host hits Giuliani: Dossier isn't why Mueller probe was started Omarosa claims Trump knew about hacked emails prior to WikiLeaks release MORE have both pleaded guilty to lying to investigators.

The Washington Post reported earlier this month that Mueller told Trump's lawyers in March that the president is not a criminal target of the Russia probe, but emphasized that he is still a subject of the investigation.