President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE is unconcerned over what his former campaign manager Paul Manafort and former national security adviser Michael Flynn have to say to special counsel Robert Mueller in their upcoming court testimonies, his lawyer says.

Ty Cobb, the president's personal lawyer, told The New York Times on Thursday that Trump has "no concerns in terms of any impact, as to what happens to them, on his campaign or on the White House."

Mueller, the special counsel overseeing the investigation into possible collusion between the Trump campaign and Russia during the 2016 election, has summoned both the former Trump aides to testify before a grand jury.

Federal prosecutors working for Mueller reportedly told Manafort, a major target of the investigation for his previously undisclosed business dealings with Ukraine, that he should expect an indictment.

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Cobb told the Times that Trump "likes and respects Mr. Manafort and appreciates the work he did for him during the three months he was with the campaign."

Trump also "likes General Flynn personally, but understands that they have their own path with the special counsel," Trump's lawyer said. Flynn was fired after failing to disclose the extent of his conversations with former Russian ambassador to the U.S. Sergey Kislyak.

Trump's comments come after multiple sources confirmed that the first charges have been filed in the investigation, as first reported by CNN. One person could be taken into custody as early as Monday, the Wall Street Journal reports.