Harvard law Professor Emeritus Alan Dershowitz said Sunday that he expects special counsel Robert Mueller's Russia investigation to end soon after the midterm elections.

"I think it happens between the midterms and when Congress convenes," he predicted on Fox News. "That means early December perhaps, well before the Christmas vacation, give us a chance to really absorb it. But that's speculative because we have to know whether the president's going to be the answering written questions."

Dershowitz, who has voiced a strong defense of President Trump's civil liberties amid the inquiry, also talked about what he expects the public to learn from the investigation.

"I think the public sees everything, you know? We eventually get all. Sometimes it gets out in dribs and drabs, but we live in a culture of leaks, so I think we'll learn everything," Dershowitz said. "Not the classified material, but with I think we'll see evidence that could lead some people to think that there was collusion and other people to think there was not. The same thing with obstruction. We may see an analysis that says, look, if you were not the president, this would constitute obstruction. But he is president, so he has certain constitutional rights others don't have."

Mueller's team is investigating Russian interference in the 2016 election and possible collusion between members of the Trump campaign and the Kremlin. Mueller expanded his probe to also look into whether Trump attempted to obstruct justice by seeking to hinder the investigation.

Dershowitz said it would be "fair" for Deputy Attorney General Rod Rosenstein, who is overseeing the investigation, to wait on releasing a report until Trump's legal team, led by Rudy Giuliani, can prepare their own response to release at the same time.