Robert Mueller's Russia probe 'is going to be devastating' for President Trump, Alan Dershowitz says

Alan Dershowitz, who has often been critical of Robert Mueller, said Sunday that the special counsel's upcoming report on possible Russian interference in the 2016 election "is going to be devastating" to President Trump.

The Harvard Law School professor emeritus told ABC's "This Week" that Trump's team is already working on a "response" to what Mueller will have to say.

“When I say devastating, I mean it's going to paint a picture that's going to be politically very devastating," Dershowitz told George Stephanopoulos. "I still don't think it's going to make a criminal case."

The probe has led to criminal charges against four Trump associates, as well as numerous Russian intelligence officers and Russian nationals.

Trump has given written answers to questions from Mueller, who has been looking into possible collusion between Trump's campaign and the Russian government. Mueller is also investigating whether Trump obstructed justice by axing former FBI Director James Comey.

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Sen. Amy Klobuchar (D-Minn.), who serves on the Senate Judiciary Committee, told Stephanopoulos that the probe may be jeopardized by the controversial appointment of Acting Attorney General Matthew Whitaker to replace ousted Jeff Sessions. Whitaker has been critical of Mueller's probe in the past.

“I'm really concerned about having him in charge," Klobuchar told ABC News. "As you know, we have tried in the Senate on a bipartisan basis, to protect that investigation by law."