A former teacher of embattled Vivek Ramaswamy scolded the Republican over a controversial attack ad he ran about his Democratic opponent, Amy Acton, in the Ohio governor’s race.

Retired teacher Michael Pogue turned up at one of Ramaswamy’s campaign events in Cincinnati on October 24 in protest, holding a banner that said, “Shame on you, Vivek! I taught you better.”

Pogue taught Ramaswamy when he was in eighth grade at Princeton Junior High School, according to the Cincinnati Enquirer, and called on his former pupil to issue a “full retraction and sincere apology” to Acton.

The attack ad received bipartisan backlash after it featured Acton’s estranged mother, Donna Arthur, who lost custody of her children after her late husband was indicted for raping Acton when she was a child. Arthur called her daughter a “liar” in the 30-second ad. He was never prosecuted on that charge before the couple fled the state.

“This latest attack on Dr. Acton hits home,” Pogue told the Enquirer .…