US President Donald Trump has called for the arming of teachers to prevent school shootings like that which left 17 people dead last week in Florida.
Trump said a staff member with a gun could end an attack "very quickly."
He floated the proposal as emotional survivors of the 14 February massacre implored him to make sure something similar does not occur again.
The Republican President also backed calls for improved background checks on gun buyers.
Other survivors meanwhile lobbied Florida lawmakers on gun
"If you had a teacher who was adept at firearms," he said, "they could very well end the attack very quickly."
"Where a teacher would have a concealed gun on them," he said, while acknowledging the plan was controversial, "they would go for special training and they would be there, and you would no longer have a gun-free zone.
"A gun-free zone, to a maniac, because they are all cowards, a gun-free zone is, 'let's go in and let's attack.'"
A dozen US states already allow concealed handguns to be carried on college premises, according to the website Armed Campuses. The state of Florida does not.
Mr Trump denied during the 2016 election campaign that he was in favour of guns in classrooms.
