Special counsel Robert Mueller has added a prosecutor who specializes in cyber crimes to his team investigating Russia's interference in the election and possible collusion with the Trump campaign.
The comment marks a departure from what Trump said last June, which is that he would be "100 percent" open to testifying in the Russian Federation investigation.
Some in the legal world had wondered why Mueller had not previously tapped a cyber prosecutor to join his team.
President Donald Trump on Wednesday held a joint press conference at the White House with Norwegian Prime Minister Erna Solberg. Moscow has also been refuting these allegations.
Forty-eight percent of voters in the Politico/Morning Consult poll said it is "very or somewhat likely" the president will be cleared on wrongdoing in the investigation, while 37 percent said "it's not too likely or not at all likely" the president will be exonerated.
Trump also railed against a frequent target, former Democratic presidential nominee Hillary Clinton.
"And when you talk about interviews, Hillary Clinton had an interview, where she wasn't sworn in, she wasn't given the oath, they didn't take notes, they didn't record and it was done on the 4th of July weekend".
Lawyers for the president have spoken with FBI investigators about a potential interview, three people familiar with the matter. The Justice Department which chose the special counsel is run by Trump's attorney general, Jeff Sessions.
"The single greatest Witch Hunt in American history continues". He proceeded to say the words "no collusion" several times more, bringing up Hillary Clinton, his Democratic opponent in the 2016 election, and insisting that the Russian Federation investigation is "a Democratic hoax" created to deflect from their 2016 White House loss.
"It has been determined that there is no collusion by virtually everybody".
Trump has repeatedly dismissed the Russian Federation investigation as a witch hunt and has denied collusion.
So far, he has charged or negotiated plea deals with four former Trump campaign or administration officials, including former national security adviser Michael Flynn and former campaign manager Paul Manafort, though Manafort's charges, so far, have nothing to do with his work for Trump. Mueller and his investigators could use any statements they consider misleading or false against him.