Cruz, a 19-year-old orphan, was wearing a gas mask and carrying smoke grenades when he opened fire with a semi-automatic weapon and killed 17 people Wednesday at Marjorie Douglas Stoneman High School in Parkland, Florida, the Associated Press reported.
Gold says Cruz's adoptive mother brought him to therapy and he had a counselor, but that all ended when she died.
Trump also said his administration will work with state and local officials to "tackle the hard issue of mental health".More news: Alzheimer's disease reversed in mouse model
A family reunites following a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., Wednesday, Feb. 14, 2018.
"I know he had his own problems, but I never thought he would be capable of this", Santos said. He weighed in on Twitter early on Thursday, calling the suspect "mentally disturbed" and stressing it was important to "report such instances to authorities, again and again!"
He was able to leave the school after the shooting by blending in with other students who were trying to escape, but he was apprehended shortly thereafter. He opened fire at terrified students and teachers.
The mugshot of suspected Florida school shooter Nikolas Cruz has been released as dark details of the teen's life continue to emerge.
"I saw him with a gun and then I saw two people fall, and then I saw Mr. Feis fall and he said, 'Get back inside, '" Pupo recalled.More news: Facebook rolls out Messenger Kids
U.S. Attorney General Jeff Sessions called the shooting a "tragic event" on Thursday, adding: "We're going to work on it in many ways to do something about it".
As Merchant talked about the shooting, less than three hours after it occurred, her little brother was still in lockdown at nearby Coral Springs Middle School.
Douglas football player Charlie Rothkopf tweeted that his coach "took [several] bullets covering other students at Douglas". A blogger who submitted a tip said it was Cruz. "They take turns, the parents do, of being out there every morning and afternoon".
Several magazines and an AR-15 rifle were found among his possessions, and officials who have examined his websites and posts on social media have found them to be "very, very disturbing".
Mr Obama proposed it after the 2012 Sandy Hook Elementary School shooting that killed 20 children, with the regulation set to have been finalized in December 2016.More news: Sebastian Janikowski's agent: 'At 39, Sebastian is too young to retire'