President Donald Trump held a freewheeling White House meeting on Wednesday to discuss various gun-control measures, at one point jabbing a Republican senator over his reluctance to raise the age of all gun purchases to 21 from 18. "I think you're afraid of the NRA," Trump said to Sen. Pat Toomey of Pennsylvania, arguing that raising the age limit was "something we have to think about." "A lot of people are afraid to bring it up," Trump said, referring to the National Rifle Association's vehement opposition to the proposal. Some Democrats, such as Sen. Amy Klobuchar of Minnesota, smiled and...