Democratic presidential hopeful Andrew Yang was overcome with emotion at a forum in Iowa on Saturday after a woman in the audience opened up about her family’s tragic experience with gun violence.

“My beautiful 4-year-old daughter Dayla was struck by a stray bullet” in March 2011, Stephanie Pizzoferrato said at the Everytown for Gun Safety event in Des Moines. “My son ― my daughter’s twin brother ― witnessed what happened that day. She died two days later.”

Pizzoferrato, a Las Vegas resident, then asked Yang what he would do as president to address unintentional shootings by children, noting that firearms are the second leading cause of death for children and teenagers in the U.S.

Before answering the question, the businessman thanked Pizzoferrato and asked if he could give her a hug.

“I have a 6 and 3-year-old boy,” Yang said as he broke down into tears. “I was imagining it was one of them that got shot and the other saw it. I’m so sorry.”

“The biggest downside of running for president for me is that I don’t get to see my family very much,” he continued. “So I get pictures, I FaceTime, I see pictures of my boys and just that scene that she described, I’m sorry, it’s just very, very affecting.”