Trump on Friday visited a hospital where numerous shooting victims were treated, as well as the headquarters of the Broward County Sheriff's Department.
"We cannot take actions that merely make us feel like we are making a difference, we must actually make a difference", Trump said.
Rally outside the White House comes amid a growing protest movement calling for stricter gun control laws in the US.
Seeking to increase pressure for gun control, the students plan to visit the state capitol in Tallahassee this week to demand immediate action. "We need our children safe", he said.
On Twitter, Trump hit out at Democrats over their alleged failure to pass gun control legislation.
As you may know already, Federal Bureau of Investigation did previously admit that they failed to follow protocol after someone called in January to tip them about the 19-year-old shooter's unusual behavior.