Alan Dershowitz, one of President Trump’s defense lawyers in the Senate impeachment trial, shot back at Sen. Elizabeth Warren after she accused him of providing an “unsupported” legal argument on Monday.

“His characterization of the law simply is unsupported,” Warren said of Dershowitz. “He is a criminal law professor who stood in the well of the Senate and talked about how law never inquires into intent and that we should not be using the president’s intent as part of understanding impeachment.”