At a joint press conference with Norwegian Prime Minister Erna Solberg, Trump tried to cushion the blow by only calling on two reporters, both from conservative outlets, but still could not manage to avoid making devastatingly bad news for himself.
After he bobbed and weaved, the President gave his real answer: "We'll see what happens".
"I've been in office now for 11 months", Trump said of the probe.
"The fact that Sneaky Dianne Feinstein, who has on numerous occasions stated that collusion between Trump/Russia has not been found, would release testimony in such an underhanded and possibly illegal way, totally without authorization, is a disgrace", Mr Trump tweeted. 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.
"For the past year we've had people around Donald Trump - even around the campaign - saying he's not mentally fit to be president", Scarborough said before pointing to his experience writing columns for The Washington Post.
American spy agencies have concluded that Mr. Putin directed a multifaceted campaign using hacking and propaganda to try to sway the 2016 presidential election against Mr. Trump's opponent, Hillary Clinton, and, eventually, in favor of his campaign.
Mr Trump has repeatedly denied colluding with Russian Federation during the campaign, and called the entire investigation a "witch hunt".
While denying collusion with Russia, Trump's tweets did not mention another aspect of an investigation led by Mueller: Claims the president sought to obstruct justice in the Russia investigation by firing FBI Director James Comey in May. Russian Federation and the world is laughing at the stupidity they are witnessing.
NBC News reported that Trump's lawyers have discussed whether to ask for stipulations to the interview, such as answering questions in writing or signing an affidavit asserting the president's innocence. It does hurt our government.
Mueller's team has come under fire from Republicans with accusations of bias.
Glenn Simpson, co-founder of the research group Fusion GPS, said he gave the dossier about Trump to the Federal Bureau of Investigation because he was "very concerned" about a potential national security matter.
Fusion GPS commended Ms Feinstein for releasing the transcript, and said Mr Simpson's "lengthy responses to the Senate Judiciary Committee's questioning speaks for itself".
"We'll see that happens".
"The only way to set the record straight is to make the transcript public", she said. But even if that is so, allowing prosecutors to interview a sitting president who has a history of hyperbolic or baseless assertions carries legal risk for him.