Rudy Giuliani on Sunday continued his assault on special counsel 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's team, but said 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's legal team hasn't spent much time crafting an argument that the special counsel's appointment was unconstitutional.

Giuliani, who joined Trump's legal team earlier this year, was pressed on ABC's "This Week" about the president's claim last month that the special counsel was "totally unconstitutional."

The appointment of the Special Counsel is totally UNCONSTITUTIONAL! Despite that, we play the game because I, unlike the Democrats, have done nothing wrong! — Donald J. Trump (@realDonaldTrump) June 4, 2018

"Frankly, we haven’t really researched that with the depth that we should to see if we would raise it. Of course, you raise every argument in favor of your client," Giuliani said.

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The former New York City mayor blasted Mueller's team over claims of bias against Trump, and suggested that would play a role in whether the president sits for an interview.

"This is the most corrupt investigation I have ever seen, that the Justice Department is allowing to go forward," Giuliani said.

Rudy Giuliani to @GStephanopoulos: "The reality is that there are biases that have to be explored surrounding Mueller...this is the most corrupt investigation I have ever seen" https://t.co/IK2UIiHS5f #ThisWeek pic.twitter.com/6yHG4LJgmL — This Week (@ThisWeekABC) July 8, 2018

Trump and his allies have sought to discredit Mueller's investigation into possible ties between the Trump campaign and Russia during the 2016 presidential election. Most recently, the president and his GOP allies seized on the release of anti-Trump texts from FBI agent Peter Strzok and FBI lawyer Lisa Page, in which the two talked about wanting to "stop" Trump's election.

Strzok was removed from Mueller's team last year once the special counsel learned of the messages.

Giuliani used his claims of bias to further cast doubt on whether Trump will sit for an interview with Mueller. The president has said publicly in the past that he'd be willing to speak with the special counsel, but Giuliani has said it's unlikely to happen.

"The reality is that there are biases that have to be explored surrounding Mueller," he said.

"And then how you could expect us to just walk our client like a lamb going to the slaughter, we wouldn’t be lawyers if we would do that," he added.

Giuliani said that Trump's legal team is looking for Mueller to prove there's a "factual basis" for the investigation. He claimed there's no proof of collusion or obstruction of justice, even though Mueller has issued no such report on those matters.

"We're not asking to show us that he committed a crime. Of course he didn't commit a crime," he said on NBC's "Meet the Press."

"What we're asking them for is, is this the witch hunt that a lot of people think it is? Or is there a factual basis for this?" he continued.

The president has frequently derided Mueller's probe as a "witch hunt" and a "hoax." Mueller has thus far obtained guilty pleas or indictments against four former Trump associates and 13 Russian nationals.

— Updated at 11:11 a.m.