Washington (CNN) President Donald Trump's attorney Alan Dershowitz on Tuesday shot back at Sen. Elizabeth Warren after the Massachusetts Democrat assailed his presentation in Trump's Senate impeachment trial as hard to follow and tweeted that his argument is "contrary to both law & fact."

"Warren doesn't understand the law," he tweeted Tuesday. "My former colleague, Senator Warren, claims she could not follow my carefully laid out presentation that everybody else seemed to understand. This says more about Warren than it does about me."

Dershowitz alleged that Warren, his former colleague at Harvard Law School, "willfully mischaracterized what I said," adding that "it's the responsibility of presidential candidates to have a better understanding of the law."

The pointed comments from Dershowitz come after Warren told reporters that his lengthy argument on the Senate floor Monday night was nonsensical. Dershowitz used his presentation to assert that even if Trump "were to demand a quid pro quo as a condition to sending aid to a foreign country, obviously a highly disputed matter in this case, that would not by itself constitute an abuse of power."

He added: "Quid pro quo alone is not a basis for abuse of power, it's part of the way foreign policy has been operated by presidents since the beginning of time."

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