Eight states have similar laws — including California, Florida and Vermont — and 29 others have introduced such bills. Backers say red flag laws would probably have prevented the shootings at a Sutherland Springs, Texas, church in November that killed 26 and at a high school in Parkland, Fla., in February that left 17 dead.
Ten people were killed May 18 in the school shooting in Santa Fe, Texas. Trump, in Texas Thursday for fund-raisers, spent more than an hour offering private condolences to some of the families affected by the shooting.
Of all the gun initiatives, such as uniform background checks or bans on assault-style weapons, red flag law proposals seem to have the greatest momentum since the Parkland shooting, winning bipartisan support in several states, said John Rosenthal, co-founder of the Massachusetts-based Stop Handgun Violence.