Sen. Mark Begich, Alaska Democrat, Sen. Mark L. Pryor, Arkansas Democrat, Sen. Jeff Flake, Arizona Republican, and Sen. Lindsey Graham, South Carolina Republican, (from left) discuss their bill to keep guns from being legally purchased by people with serious mental health problems. (Associated Press)

Sen. Mark Begich, Alaska Democrat, Sen. Mark L. Pryor, Arkansas Democrat, Sen. Jeff Flake, Arizona Republican, and Sen. Lindsey Graham, South Carolina Republican, (from left) discuss their bill to keep guns from being legally purchased by people with serious mental health problems. (Associated Press)