Images of the group sitting in the Washington office of the Kentucky senator were shared on social media. Their message was: "Your inaction is literally killing us."
"This is disappointing, even for the low expectations we've learned to have for any form of gun legislation," a state legislator told the Salt Lake Tribune.
Guns are the second-biggest killer of children in the U.S., after motor vehicle accidents.
"There's nothing else I think about wanting to do," said Fred Guttenberg. "There's nothing else I care about."
Campaign groups identify 10 states where pro-gun lawmakers could be forced out.
Nugent previously described the students as "soulless," "mushy-brained children."
"I see my father's movement and legacy manifesting itself through these movements that are occurring today."
"We are a society of rules," a school board member said when asked about punishments for students who participated in the school walkout to protest gun violence.
The march is over, but students have politicians in their sights and gun control activism is set to continue through the 2018 midterms.
"The root problem is we need to change people's behavior and that can only happen with a change of heart and we believe only the gospel of Christ can do that."
Joshua Kushner donated $50,000 to the March for Our Lives campaign.
"Are you SERIOUSLY mocking a school shooting survivor for her ethnicity?!" asked a survivor of the Pulse nightclub shooting.
Pope Francis called on young people not to to be silenced.
The NRA claimed that "gun-hating billionaires and Hollywood elites" are exploiting children.
A mass shooting at a Florida high school that left 17 dead has given rise to a new generation of student activists.