Stanford Law School's Pamela Karlan is expected to testify before the U.S. House of Representatives Judiciary Committee today that Donald Trump must be held accountable for demanding foreign interference into the 2020 presidential elections to smear a political opponent.

Karlan is among four law professors who are set to testify before the House Judiciary Committee this morning as it starts its portion of the impeachment inquiry, which is investigating whether Donald Trump withheld aid to Ukraine in exchange for a public pledge that the nation's newly elected government open an investigation into Joe Biden and his son, Hunter Biden.

"Based on the evidentiary record, what has happened in the case before you is something that I do not think we have ever seen before: a president who has doubled down on violating his oath to 'faithfully execute' the laws and to 'protect and defend the Constitution,'" Karlan is expected to say, according to a copy of her prepared remarks. "The evidence reveals a president who used the powers of his office to demand that a foreign government participate in undermining a competing candidate for the presidency."

Karlan is set to testify alongside Harvard Law School's Noah Feldman, Michael Gerhardt from the University of North Carolina School of Law, and Jonathan Turley of the George Washington University Law School, all of whom have released their own prepared statements. Turley is expected to be a witness for committee Republicans.

Karlan is currently serving as the chair of the board of directors for the American Constitution Society, a progressive legal organization, and was the deputy assistant attorney general for voting rights at the Justice Department during the Obama administration. She has also argued before the U.S. Supreme Court several times and is the co-founder of Stanford Law School's Supreme Court Litigation Clinic.

Karlan also is expected to tell panel that the framers of the U.S. Constitution intended for impeachable offenses to include a president's decision to put his own private ends before the nation's interests, according to her prepared remarks.

"That is not politics as usual—at least not in the United States or any other mature democracy," according to Karlan's prepared remarks. "It is, instead, a cardinal reason why the Constitution contains an impeachment power. Put simply, a candidate for president should resist foreign interference in our elections, not demand it."

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