The students were expected to meet with a lawmaker who is seeking to ban the sale of assault-style weapons like the AR-15 allegedly used in the school shooting.
The Network for Public Education, an advocacy organization for public schools, announced a day of walkouts, sit-ins and other events on school campuses on April 20, the anniversary of the 1999 shooting at Columbine High School in Colorado that left 12 students and one teacher dead.
Yesterday protestors chanted "shame on you" to United States lawmakers and the president. "We see the tragic consequences of those failures", Sessions said in a statement.
What are the students' plans?Their mistakes have cost the lives of 17 people. "We are losing our lives while the adults are playing around".
Stunned by the worst high school shooting in U.S. history, students across the country were mobilising on Sunday for stronger gun laws, while Florida officials contemplated when to reopen their school.
"If the president wants to come up to me and tell me to my face that it was a awful tragedy and. how nothing is going to be done about it, I'm going to happily ask him how much money he received from the National Rifle Association", said Ms Gonzalez. "I was scared, but I want to support him no matter what because I know he's not doing it for the wrong reason", Bubel explained.
Charles Nemeroff, Miller School of Medicine professor and chairman in the Department of Psychiatry and Behavioral Science clinical director, said the trauma experienced as a result of the shooting will be far and wide, impacting families and friends of the victims, as well as those who responded to the emergency.
Before the Stoneman Douglas students march on Washington, they're heading to Tallahassee to speak to state leaders, Jaclyn Corin, a student who organized the visit, told NBC.
According to the Center for Responsive Politics, the NRA spent $11.4m (£8.1m) supporting Mr Trump in the 2016 campaign, and $19.7m opposing Hillary Clinton. Must always report such instances to authorities again and again.
The left is, as usual, demanding gun control - and it has enlisted several students from the school in its cause. "But as you look around at how many people who are here ... there are thousands more who are doing something really lovely for my sister".
At funerals and in the streets of Parkland, a suburb on the edge of the Everglades, anger bubbled over at the senselessness of the shooting and at the widespread availability of guns. He says it's about not getting the confessed shooter, Cruz, help.
Saturday's rally coincided with a gun show in Florida.
What do we know about the suspect?
Instead of going to classes, she urged her fellow students to stage protests on the 19th anniversary of the mass shootings at Columbine High School in Colorado.
"He's gone through a lot in a very short period of time and that does not minimize the loss of those families, but we have to put that into the proper light", Weekes told KTLA.
'Eagles, I promise you, I will hug each and every one of you as many times as you need and I will hold you as long as you need me to - for all 3,300 of you and your families - and we will get through this together, ' he said.
Robert Lasky, the special agent in charge of the FBI's Miami office, said Thursday the bureau had been warned about a comment made on YouTube by a user with the name Nikolas Cruz. "Today, I call on Gov. Rick Scott, the Florida Senate and the Florida House of Representatives to step up to the plate!" This is not acceptable. They want to see the end before we have our own kids.