Open this photo in gallery: Mahmoud Khalil’s case sparked outcry from pro-Palestinian and civil rights groups.Spencer Platt/Getty Images Mahmoud Khalil, the Columbia University student and pro-Palestinian activist who was detained by U.S. immigration authorities for more than 100 days, is seeking US$20-million from the Trump administration over what he says was his false imprisonment and malicious prosecution. Khalil’s lawyers on Thursday said they submitted the claim against U.S. President Donald Trump’s departments of Homeland Security and State under a law requiring people to seek damages directly from the government before they can file a lawsuit. Officials have six months to...