Washington (CNN) James Roche, one of Supreme Court nominee Brett Kavanaugh's freshman year roommates at Yale, said Wednesday that Kavanaugh lied under oath about his drinking and about the meaning of his yearbook entries.

In an op-ed for Slate, Roche writes, "Brett Kavanaugh stood up under oath and lied about his drinking and about the meaning of words in his yearbook. He did so baldly, without hesitation or reservation."

"In his words and his behavior, Judge Kavanaugh has shown contempt for the truth, for the process, for the rule of law, and for accountability," Roche added. "His willingness to lie to avoid embarrassment throws doubt on his denials about the larger questions of sexual assault."

Kavanaugh testified to the Senate Judiciary Committee that he has never been blackout drunk. He was appearing before senators to answer an accusation from California professor Christine Blasey Ford that he sexually assaulted her when they were both in high school in the early 1980s. Kavanaugh denies the allegation and says he has no memory of the party where Ford says the incident happened.

Roche says he believes his friend Deborah Ramirez, who has accused Kavanaugh of exposing himself to her at a college dorm party.

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