 This is All Things Considered from NPR News. I'm Elsa Chang. And I'm Juana Summers. There is still a lot that we don't know about the attempt on former President Donald Trump's life on Saturday. Background information about the alleged shooter is thin and nothing so far indicates any clear sense of motive. That information void has been filled by all kinds of theories, theories that people latch on to without basis and that pose a danger all their own. For more, we're joined by NPR's Huo Jingnan. Hi there.