Rachel Mitchell, in questioning the woman who has accused U.S. Supreme Court nominee Brett Kavanaugh of sexual assault, is playing the delicate role of a prosecutor examining a witness and a forceful defense attorney.

Mitchell, the veteran Arizona sex crimes prosecutor brought in to pinch-hit for the Republican men on the Senate Judiciary Committee Thursday, has been a polite and engaging force, as she’s probed Ford’s memory. Christine Blasey Ford said she is “100 percent” certain Kavanaugh sexually assaulted her in a bedroom at a social gathering in suburban Washington, D.C., in the 1980s when both were still in high school. Kavanaugh has denied the allegations.