Today, Congress hears survivor stories from Uvalde, Texas and Buffalo, New York — the latest effort in the push for new gun laws. Meanwhile, the House is taking action on age limits for weapons, and on high-capacity magazines. What chance do these measures stand in the Senate? Also tonight, we're awaiting live remarks from President Biden at the Summit of the Americas in Los Angeles. We'll have more on what will happen there, and on the world leaders who are not there. Plus, a special diet is helping some diabetes patients get off of their expensive medications. We'll show you in our special series "Beyond the Scale."