The mother of a victim in the Florida school shooting pleaded with President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE to take action to prevent another shooting from happening.

"How do we allow a gunman to come into our children's school? How do they get through security?" she asked on CNN.

Lori Alhadeff — whose daughter Alyssa was killed Wednesday when a gunman opened fire at a South Florida high school — questioned what security there is at the school.

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"A gunman, a crazy person just walks right into the school, knocks down the window of my child's door and starts shooting, shooting her and killing her," she said.

"President Trump, you say what can you do. You can stop the guns from getting into these children's hands."

She said Trump can do a lot to prevent tragedies like these from happening, suggesting that metal detectors could be put at entrances to the school.

"This is not fair to our families," she said.

"President Trump, please do something. Do something, action," she said. "We need it now. These kids need safety now."

At least 17 people were killed and more were wounded when a gunman opened fire at a school in Florida on Wednesday.

Multiple lawmakers have called for Congress to take action in the wake of the tragedy.

Trump on Thursday addressed the nation, saying he plans to visit the Florida high school where the shooting took place.

The president also said he would "tackle the difficult issue of mental health," but did not weigh in directly on the contentious debate over gun control.

He also vowed his administration will seek to address safety issues in schools.