Thousands of teachers used #ArmMeWith on social media with requests ranging from "politicians who care more about kids than donations" to "smaller class sizes so that no student feels invisible."
During a powerful address in Tallahassee, Prado lamented the failure of a system that allowed Cruz to purchase a gun.
There are also various marches planned in the coming months.
Kimberly Snead said in her first TV interview Monday that she'd struggled to find words when she saw Cruz after: "Really, Nik? Really?"
The student reportedly violated the school's "Withholding Information" portion of the handbook.
Kentucky Governor Matt Bevin's opposition to gun control appears to stem from personal anecdotes and dubious data.
"At a time like this, people want to feel safer," one expert told Newsweek.
The 18-year-old's alleged plans were discovered after his grandmother found his journal.
The education secretary also reaffirmed her stance that states and local school districts should determine "the unique security needs in their local schools."
The National Rifle Association urged its nearly 500,000 followers to "buy your loved one a gun" on Valentine's Day as a teenager in Florida was opening fire on his former high school classmates with an AR-15 assault rifle.
The mother of Ava Rose Olsen said it was "ridiculous" that children were going to school fearing for their safety.
Los Angeles police say a 15-year-old boy is in critical condition after being shot in the temple.
"She couldn't say anything, and I tried to call her name over and over and over, and she never responded," said her mother.
"You don't suffer some of the wounds these patients suffered and just move on with life," he said.
The suspected gunman in a California shooting that left four dead and multiple injured was a white male who had threatened women before and was set to face trial for stabbing and robbing women in the community.
Students shot at a Northern California Elementary School.
He faces four counts of first-degree murder, seven counts of attempted murder and unauthorized possession of a firearm.
Colin Brough died; Nicholas Prato, Kyle Zientek and Nicholas Piring were wounded.
One person is dead and three were wounded.