WASHINGTON (AP) — When shots rang out last year at a high school in Parkland, Florida, leaving 17 people dead, President Donald Trump quickly turned his thoughts to creating more mental institutions.

When back-to-back mass shootings in Dayton, Ohio, and El Paso, Texas, jolted the nation earlier this month, Trump again spoke of "building new facilities" for the mentally ill as a way to reduce mass shootings.

"We don't have those institutions anymore and people can't get proper care," Trump lamented at a New Hampshire campaign rally not long after the latest shootings.

Now, in response to Trump'...