 The Republican Convention is underway and already generating news. The Republican nominee, former President Donald Trump, chose his running mate, Ohio Senator J.D. Vance. CBS's Robert Costa is at the convention in Milwaukee. Senator Vance is now formally former President Trump's running mate. This is a historic moment for the Republicans, a 39-year-old. This is someone who has adopted Trump's ideological platform in recent years since his election to the Senate in 2022. Demonstrators are also at the convention.