3. During his news conference in Seoul, Mr. Trump was asked whether he would support “extreme vetting” of gun buyers, comparable to extra scrutiny for immigrants from predominantly Muslim countries, which he has said is necessary to combat terrorism.

He replied that stricter gun laws would not have prevented the Texas shooting, and could have driven the death toll into the hundreds, since the gunman was shot by an armed bystander before later killing himself, officials said. More details emerged about the suspect, who was reported to have escaped from a psychiatric facility in 2012.

We looked at the data on why the U.S. has so many mass shootings. The answer, it turns out, is lying in plain sight. And today on our podcast “The Daily,” we look at why a domestic violence conviction did not stop the suspect from buying weapons.

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