It was a day of tense exchanges, emotion-packed speeches and confrontation as lawmakers, students and parents sparred on Wednesday over what to do about shootings in American schools.

From the nation’s capital to Florida’s State House, people affected by gun violence delivered pain-laced addresses to crowds of passionate supporters, and President Trump listened to a group he had summoned to discuss the problem. There was also some poignant symbolism.

Here are some of the most remarkable moments:

‘What is your definition of a well-regulated militia?’

At an intense town hall-style meeting Wednesday night, Diane Wolk Rogers, a history teacher at Marjory Stoneman Douglas High School in Parkland, Fla., confronted a spokeswoman for the National Rifle Association over the Second Amendment. How did allowing the 19-year-old shooter in last week’s massacre to own an assault rifle represent “a well-regulated militia” as is written in the amendment, she asked.

“Using supporting detail,” Ms. Wolk Rogers said to thunderous applause at CNN’s “Stand Up” town hall, “explain to me how an 18-year-old with a military rifle is well regulated.”