NEWTON, Iowa — The moments happen all across the country. Tiny faces, peering out from behind their parents, or timidly accepting a microphone as the room falls silent. They make eye contact with a larger-than-life presidential candidate and ask: Can you keep me safe at school? Can you stop the shootings?

The questions from children have become a hallmark of the 2020 presidential campaign, with nearly every candidate facing some version of the same emotional query.

Perhaps Sen. Cory Booker was looking for a softball question when he called on 8-year-old Scout Maloney at a town-hall-event in Nashua, New Hampshire, last month. That isn't what he got.

"What do you plan to do about school shootings?" Scout asked, telling Booker, D-N.J., that she and her brother are home-schooled in part because their parents fear they could become the victims of gun violence.

Scout Maloney hugs Sen. Cory Booker, D-NJ, at an event in New Hampshire in July. Courtesy of the Maloney Family

Booker told Maloney — and her parents — that he believes his is the strongest plan among the 2020 field to stop mass shootings, saying it would require national licensing and registration of firearms. He also added a personal touch.

"I get very tired, Scout, and I get angry," he said, "because I'm a person of faith, and I hear these people coming up with thoughts and prayers, but I was taught faith without works is dead."

In Scout's case, her parents also attended the event, and encouraged their daughter to ask the question. In some cases, older students are members of advocacy groups, like Every Town for Gun Safety.

In the days after a mass shooting at the University of North Carolina at Charlotte campus in April, school safety was top of mind for middle school student Milan Underberg, who broke down while questioning Beto O'Rourke when he visited her classroom here in Newton.

"I'm afraid that one day I'll go to school and I'll never come out. ... I'm sorry," she said, pausing to collect herself and then continuing through tears. "What actions will you take to protect people like me and my classmates from this happening?"