Trump also said school safety was a "top priority" for his administration, with meetings on the subject planned through next week, when he holds talks with governors from all 50 US states.
![Troublemaker removed from a plane (image used for illustrative purpose) [Shutterstock]](data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20width%3D'100'%20height%3D'100'%20data-ring-placeholder%3D'1'%3E%3C%2Fsvg%3E "Troublemaker removed from a plane (image used for illustrative purpose) [Shutterstock]")
Calls to ban bump stocks have been mounting since Stephen Paddock, a retired accountant, used them on several of his weapons to kill 58 concertgoers in Las Vegas in October 2017 in the deadliest mass shooting in recent US history.
Although the former student who shot dead 17 people in Florida last week did not use bump stocks, there has been a renewed focus on the devices because outlawing them is a rare point of agreement between Democrats, some Republicans and the powerful National Rifle Association (NRA) gun lobby.
Less than a week after the shooting, the Florida state House of Representatives rejected a ban on assault weapons and large capacity magazines in a 36-71 vote, during a session that opened with a prayer for the people killed in the tragedy.
About 100 student survivors of the tragedy plan to hold a gun control rally and speak with lawmakers about gun control and school safety Wednesday at the state Capitol in Tallahassee.
Trump -- who received strong backing from the NRA during his White House run -- said he had signed a memorandum "directing the attorney general to propose regulations to ban all devices that turn legal weapons into machine guns."
The president said he expected the measures to be finalized "very soon."
"We must move past cliches and tired debates and focus on evidence-based solutions and security measures that actually work," Trump said at a White House event to honor 12 Americans for heroism.
"We must actually make a difference... We must do more to protect our children."
Trump said he would meet this week with students, local leaders and members of law enforcement to develop "concrete steps" to protect schools, students and communities.
"This includes implementing common sense security measures and addressing mental health issues," he said, "including better coordination between federal and state law enforcement to take swift action when there are warning signs."
"Whether we are Republican or Democrat, we must now focus on strengthening Background Checks!" he added later on Twitter.
Florida school shooter Nikolas Cruz, 19, had a history of troubling behavior and a person close to him warned the FBI five weeks before the shooting that he was a threat -- but no action was taken.
Parkland students take action
Cruz legally bought the gun he used in the attack -- an AR-15-style semi-automatic rifle -- and the White House said it would consider options to raise the age for such purchases.
"I think that's certainly something that's on the table for us to discuss and that we expect to come up over the next couple of weeks," spokeswoman Sarah Sanders told reporters.
Many of the students who survived the shooting have vowed to make the tragedy a turning point in America's deadlocked debate on gun control.
They are planning a "Narch for Our Lives" in Washington next month, and they earned at least $2 million in pledges from Hollywood A-listers. Sister rallies are set to take place around the country.
George Clooney and his human rights lawyer wife Amal, Oprah Winfrey, director Steven Spielberg and his wife, actress Kate Capshaw, and film producer Jeffrey Katzenberg and his wife Marilyn each pledged $500,000.
"Amal and I are so inspired by the courage and eloquence of these young men and women," Clooney said in a statement.
"Our family will be there on March 24 to stand side by side with this incredible generation of young people from all over the country."
Winfrey then tweeted: "George and Amal, I couldn't agree with you more. I am joining forces with you and will match your $500,000 donation."
The US Congress is deadlocked on the gun control debate, accomplishing nothing since the October shooting in Las Vegas.
Americans support stricter gun laws by a 66 percent to 31 percent margin, according to a poll released on Tuesday by Quinnipiac University.
It described the margin as "the highest level of support" for stricter gun control since it began surveys on the question in 2008.
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