Donald Trump has said he does not think Michael Cohen, his longtime personal lawyer and fixer, will "flip" and co-operate with criminal investigators.
Mr Trump defended Mr Cohen as "a fine person" and accused the media of trying to turn the lawyer against him.
The FBI raided Mr Cohen’s office, home and hotel room earlier this month.
Agents seized documents that could lay bare details of Mr Trump’s past business dealings and private life.
The New York Times published an article suggesting Mr Trump had a history of mistreating Mr Cohen and that the lawyer would end up "flipping" and turning against him.
In a series of tweets on Saturday Mr Trump wrote that he had always "liked and respected" Mr Cohen who was a "fine person with wonderful family".
He said: "Most people will flip if the Government lets them out of trouble, I don’t see Michael doing that despite the horrible Witch Hunt and the dishonest media!"
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Mr Trump also directly attacked The New York Times, and its reporter Maggie Haberman, accusing them of seeking to "destroy Michael Cohen and his relationship with me in the hope that he will ‘flip’".
Some of the documents seized from Mr Cohen reportedly relate to a $130,000 payment he made to Stormy Daniels, a porn star who claims she had a relationship with Mr Trump over a decade ago, which Mr Trump has denied.
Prosecutors have said they are investigating Mr Cohen’s personal business dealings, but have not said what crime they believe he may have committed.
Mr Cohen’s lawyers have called the FBI raid an assault on attorney-client privilege, and Mr Trump has called it an "attack on our country".
Mr Cohen once said that he would "take a bullet" for Mr Trump.
The New York Times defended its reporter and stood by its story.
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