Trump told NBC's Lester Holt that he wants the FBI’s investigation to “be so strong and so good."

“And I want it to happen,” he said. "If Russia did anything, I want to know that.”

Trump said he would consider the possibility that the investigation needs to be lengthened.

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"As far as I'm concerned, I want that thing to be absolutely done properly," Trump said. “I said to myself, I might even lengthen out the investigation, but I have to do the right thing for the American people."

Meanwhile, Trump insisted there was "no collusion between me and my campaign and the Russians," which was one of the allegations the FBI was investigating.

During the interview, Trump defended his decision to fire Comey, which sent ripples across Washington and prompted outcry among Democrats.

Lawmakers from both parties have questioned the timing of the firing, with portions of the White House's explanation coming into question on Thursday.

Trump said that he wants someone "competent" handling the FBI investigation and he has no doubts about the bureau itself.