Sen. Dick Durbin Richard (Dick) Joseph DurbinMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Senate Republicans signal openness to working with Biden Top GOP senator calls for Biden to release list of possible Supreme Court picks MORE (D-Ill.) on Tuesday criticized one of President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE’s impeachment defense lawyers, Alan Dershowitz Alan Morton DershowitzDershowitz suing CNN for 0 million in defamation suit Bannon and Maxwell cases display DOJ press strategy chutzpah Ghislaine Maxwell attorneys ask for delay to unseal court documents due to 'critical new information' MORE, for his suggestion that it would not be helpful to have former White House national security adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE testify during the Senate trial.

Part of Dershowitz’s argument before the Senate on Monday night centered on the fact that even if Bolton’s accusations that Trump tied aid for Ukraine to investigations of political rivals, reported as part of a leaked manuscript of his forthcoming memoir, are true, the alleged actions wouldn't “constitute an impeachable offense.” He added that this meant there is no need for Bolton to testify before the Senate.

Durbin fired back in an appearance on CNN, saying that Bolton testifying is the "best way for us to have an outcome in this trial that is credible."

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“I would just say, professor Dershowitz, Harvard law professor with great credentials in criminal law, standing before us waving Blackstone’s book and quoting him, to have him say to us, ‘Don't bring a witness in, there’s nothing he could possibly say of importance or relevance,’ give me a break, professor,” Durbin said on CNN’s “New Day.”

“You can say that in your classroom, but in the real world we believe people under oath telling the truth are the best way for us to have an outcome in this trial that is credible across America.”

.@SenatorDurbin on Trump lawyer Alan Dershowitz claiming nothing in Bolton revelations is impeachable: "Give me a break, professor. You can say that in your classroom, but in the real world...people under oath telling the truth are the best way for us to have an outcome." pic.twitter.com/D0xrk988V3 — New Day (@NewDay) January 28, 2020

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Senate Democrats have been pushing for witnesses as part of the trial, but Republicans have been reluctant to agree. A vote on whether to compel witnesses and documents is expected later this week, and Democrats need at least four Republicans to join them to pass the measure.

The New York Times reported Sunday night that Bolton claims in his forthcoming memoir that Trump held up Ukraine aid to pressure the president of that country to announce investigations into former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE and his son Hunter Biden, bolstering Democrats’ push for the former White House official to testify.

Some Republicans have suggested agreeing to a trade: allowing Bolton to testify if Republicans can call Hunter Biden.

Durbin, like many of his colleagues, dismissed the idea. He doubled down on the fact that Hunter Biden has no knowledge of Trump’s decisions and the allegations at the center of the impeachment charges.

“Listen, we’re not trading baseball cards, we're not kids sitting around here picking our favorites and putting them in the middle of the circle. What we’re talking about are relevant material witnesses,” Durbin said on CNN.

“This idea of bargaining, well we’ll give you one irrelevant witness for one relevant witness, baloney,” he added.