Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE criticized Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE Wednesday for expanding upon his decision not to implicate or exonerate President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on obstruction of justice after the special counsel made a rare public statement.

Giuliani, who has served as Trump's personal attorney for much of Mueller's investigation into Russian interference in the 2016 election, took issue with the special counsel underscoring that investigators were not able to exonerate the president on obstruction charges.

"The reality is that he gave us his opinion on collusion and obstruction," Giuliani said on Fox News. "And his opinion is you can’t bring a case. Bob, that’s the end of it. That’s what a prosecutor does. And you don’t prove negatives."

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"What they’ve done here is a perversion," Giuliani continued. "A combination of him and the media. And I’m surprised at Bob because he’s a better lawyer than that. I don’t know where this notion came that you have to exonerate."

Mueller, in his first public comments on his two-year investigation into Russian interference in the 2016 election, said that his office did not charge Trump with a crime because it “was not an option” under Department of Justice regulations that state a sitting president cannot be charged with a crime.

“After that investigation, if we had confidence that the president clearly did not commit a crime, we would have said that,” Mueller said.

Mueller did not clarify whether his office would have charged Trump with a crime if the DOJ guidance were not in place.

The special counsel's comments stirred discussion among Democrats on Capitol Hill about launching impeachment proceedings, but Giuliani hammered the special counsel for weighing in on Trump's innocence.

The president's attorney suggested Mueller had "lost his notion of American fairness" because of time spent with prosecutors on his team, including Andrew Weissmann.

"To me as a lawyer it’s astounding that he’s expounding on can we exonerate or can’t we exonerate," Giuliani said.

Giuliani echoed his client, who shortly after Mueller's statement declared it was "case closed," arguing that Mueller had no case on either collusion or obstruction.

“That’s all that matters from the point of view of a prosecutor," he said. "The real question is to whether it’s ethical at all for him to be discussing it or writing about it."

Giuliani has been among the Trump allies who have claimed for weeks that Mueller cleared the president of conspiracy with the Russian government and obstruction of justice.

But Mueller's comments on obstruction are likely to stoke further furor among Democrats on Capitol Hill, several of whom have called for a start to impeachment proceedings.