 Support for NPR comes from NPR stations. Other contributors include the William T. Grant Foundation, supporting research to improve the lives of young people. Online at wtgrantsfoundation.org. And listeners like you who donate to this NPR station. The Republican convention begins today in Milwaukee, Wisconsin. Its nominee for president will be Donald Trump, who was the target of an assassination attempt over the weekend. In a few minutes, we'll ask Milwaukee's mayor how his city is preparing.