Police seek motive for deadly shooting rampage at Michigan State University

<p>Hours after America’s latest shooting rampage, police are trying to figure out why a gunman opened fire at Michigan State University. Three students are dead and five are wounded as new information is emerging about the now deceased shooter and the note he left behind. Plus, the White House reveals updates on the three mysterious objects shot down by U.S. fighter jets. Also, Nikki Haley becomes the first Republican to challenge Donald Trump for the GOP nomination in 2024.<br><br></p><p>To learn more about how CNN protects listener privacy, visit cnn.com/privacy</p>