Trump is pushing to expand involuntary commitment laws. Apu Gomes/Getty Images New York —

Last month, a homeless man with a history of serious mental illness killed a woman on a Charlotte train. The murder, shown on video, spurred calls from some for a tougher approach to dealing with the rise of homelessness and mental health issues across the United States.

A record number of Americans are living on the streets, roughly a quarter with schizophrenia, bipolar disorder or other severe mental illness. The overwhelming majority pose no public danger , and research links only 3% to 5% of violent acts to those with serious mental illness.

President Donald Trump, however, frames homeless people with mental illness as a public safety threat. The solution, he says, is to commit m

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