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Legal expert and law professor Jonathan Turley thinks Deputy Attorney General Rod Rosenstein should recuse himself from the ongoing Russia probe.

On "The Story" tonight, Turley explained that Rosenstein is both the ultimate authority in the investigation and also a witness.

"If you think that you're a material witness - and I think that's demonstrably the case that he's a material witness - he should have taken himself out of the mix at that time," Turley said, adding that Rosenstein's recusal is now about 90 days overdue.

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He said it's clear now that Special Counsel Robert Mueller is pursuing the obstruction of justice allegations against President Trump.

"We just saw a list of high-ranking FBI officials who have said they expect to be called before the grand jury," Turley said. "Rod Rosenstein would have to be at the top of that list."

He pointed out that it was Rosenstein's memo that was cited by the White House to justify the firing of former FBI Director James Comey, which makes him a "very important witness."

"It's very odd to have Mueller reporting to an individual who has not only evidence, but a personal or at least a professional stake in this," Turley said. "His actions, his decisions, are going to come under scrutiny before this grand jury if it's looking at obstruction. He shouldn't have the investigator on the scope of that investigation reporting to him."

Watch more above.

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