Trump rally shooter researched Michigan mass shooter Ethan Crumbley and his family prior to attack

​ The Trump rally shooter searched online for information on the arrest of a Michigan mass shooter and his parents, who were prosecuted in a 2021 high school shooting. He visited websites for how to build explosives. And in the minutes before he fired shots in an attempted assassination of Donald Trump, he screenshotted a picture from a livestream of the Butler, Pennsylvania, rally. Read More Breaking News, Latest News and Videos | CNN