Later this week, Trump will meet with local and state officials, and also plans to talk with governors about the issue.
A 2013 poll by the National Education Association found that only 22 percent of teachers said they liked the idea of arming staff. "Not all of 'em, but you would have a lot".
Pollack said he met with Trump in the oval office during his visit to Washington.
The attack at Marjory Stoneman Douglas High School in Parkland, Florida - where 17 students and educators were slain on Feb 14 by a gunman with an AR-15 semi-automatic assault rifle - has revived the long-running USA debate over gun rights.
Another photo taken by Associated Press photographer Carolyn Kaster reveals more of what was on Trump's notes.
Training and providing 1 in 5 American teachers with a gun is expensive too.
The Broward County sheriff said Thursday that Peterson had resigned after being suspended without pay. "Does anybody have an idea for a solution to the school shooting, and the school shootings that we've gone through over the years?"
"In a lockdown situation, my job is to get my students to a safe place, out of view of an intruder".
Others did counsel changes in gun laws, most forcefully, Sam Zeif, a Jewish senior at the school whose text exchanges with his younger brother while both were under siege went viral.
The President said Thursday that he does not think that simply boosting the number of armed guards in schools would be enough to stop school shootings.
As per U.S. federal laws, people must be at least 21 years old to buy a handgun from a licensed dealer, but they have to be only 18 to purchase a rifle or shotgun. "If they thought like if this guy thought that other people would be shooting bullets back at him, he wouldn't have gone to that school".
"Time has stood still", said Sam Zeif, Parkland School Shooting survivor. Far more assets at much less cost than guards.
Trump has also insisted that per his proposal, not all teachers would carry concealed weapons.
"Gun free is an invitation for these insane people to just come in and shoot", Trump says. He added: "If you had a teacher with-who was adept at firearms, they could very well end the attack very quickly".