Former Attorney General Alberto Gonzales said on "America's Newsroom" on Tuesday that it would be a "dumb idea" for President Donald Trump to take over Special Counsel Robert Mueller's Russia investigation.

Trump asserted on Monday that he would be "totally allowed" to "be involved" in the probe, which he has repeatedly derided as a partisan "witch hunt."

"I can go in, and I could do whatever — I could run it if I want," Trump told Reuters. "But I decided to stay out. I’m totally allowed to be involved if I wanted to be. So far, I haven’t chosen to be involved. I’ll stay out."

Gonzales said an investigation of the White House conducted by the President of the United States would not have any credibility in the minds of most Americans.

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Gonzales acknowledged that the president, as the head of the executive branch, would have the constitutional authority to "take over" the Mueller probe, but Congress has delegated the authority to conduct such an investigation to the Justice Department.

"As a theoretical matter, I think that the president certainly could. Honestly, speaking in layman's terms, it would be a dumb idea," Gonzales said.

He said the investigation should be continued to its completion, because it's vitally important to get to the bottom of how Russia interfered in the 2016 election.

"In terms of the length of this investigation, it hasn't been unreasonably long compared to the length of previous investigations by special counsels," Gonzales said. "I think we need to let Bob Mueller complete this investigation, so we know fully, exactly what Russia did in 2016 and what they intend to do in the future."

See more from Gonzales in the "America's Newsroom" clip above.

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