President Biden ranted against ownership of what he called “high-caliber weapons” Monday — appearing to suggest that there should be restrictions on the most popular handgun in America, the 9mm pistol, and repeating a previously debunked claim that the Second Amendment prohibits ownership of cannons. Speaking to reporters outside the White House after returning to Washington from a weekend that included a visit to the site of last week’s mass shooting in Texas, Biden recounted a visit to a trauma hospital in New York, where he said doctors had showed him X-rays of gunshot wounds caused by various firearms. “They...