President Trump's sister, Maryanne Trump Barry, ruled against the use of a 1952 law to grant the executive sweeping authority to deport someone from the country. The Trump administration is using the same law to remove green card holder Mahmoud Khalil from the country. Khalil, a pro-Palestinian protester and Columbia grad student, has not been charged with a crime but has been found to conflict with U.S. policy. His lawyers are citing the First Amendment as they fight his deportation.