Trump said several of the governors in the meeting were "so scared" of the NRA, but acknowledged that the leaders would have to "sometimes" fight against them.
"You don't know until you're tested, but I think I really believe I'd run in there even if I didn't have a weapon", Trump told a gathering of the nation's governors at the White House. "We have to harden our schools, not soften them up", Trump said. At least three other officers reportedly held back from entering the building during the massacre.
That's not likely to change with Marjory Stoneman Douglas High School students and teachers back at school for the first time since the shooting almost two weeks ago.
Trump urged governors to revisit the closure of mental institutions, saying there should be a half-measure between institutionalisation and leaving potentially risky people "in their house". "We don't want sick people having the right to have a gun".
The White House has said Trump supports bipartisan legislation from Sens.
Trump said on Twitter that arming educators and paying their bonuses would be "very low-cost". "They're on our side".
When video released of uniformed deputy Scot Peterson waiting outside the school rather than attempting to confront the killer, Trump ripped the school security guard to shreds.
Asked by CNN's Jim Acosta if the President has been trained in using a handgun or firearm, Sanders said "I don't think that was the point he was making".
Washington Governor Jay Inslee, a Democrat, told Trump that teachers in his state do not want to carry weapons.
"In my year as First Lady, I have also learned that it's oftentimes after a tragedy that you see the strength and resilience of the human spirit".
Trump argued Friday for his proposal to arm some teachers, arguing that posting armed police officers in schools wouldn't work because they don't "love the children" the same way.
A bump stock is attached at the end of a firearm, the part of the gun that rests on the user's shoulder.
The president also expressed confidence bump stocks would be banned.
Trump and the NRA, which holds great influence over Republican lawmakers, appear at odds over his notion of raising the age limit to buy semiautomatic guns to 21.