US President Trump blamed "mental health" and "evil" rather than readily available assault weapons for Sunday's mass shooting in Texas.
During a press conference in South Korea, the president was asked if he would consider "extreme vetting" for gun purchases, similar to what he has demanded for foreigners entering the U.S.
"Well, you're bringing up a question that probably shouldn't be discussed too much now, we could let a little time go by, but it's OK if you feel that's an appropriate question, even though we're in the heart of South Korea", Trump said.
The Air Force acknowledged Monday that if the past offenses by Devin Patrick Kelley had been properly shared, they would have prevented him from buying a gun.
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In 2012, Kelley, a licensed unarmed security guard and former Air Force airman, was court martialled and convicted of domestic violence against his wife and step-son, and he received a bad conduct discharge. Based on preliminary reports, the attack was carried out by "a very deranged individual", he said.
After that conviction, Kelley would have been prohibited under federal law from buying or possessing firearms.
He says there are often other mitigating factors that lead to situations like the shooting in Texas.
Associate professor of health science from Ball State University, Jagdish Khubchandani, says when a mass murder occurs, the mentally ill are often used as the scapegoat.