Mahmoud Khalil. Photo : AP An immigration appeals board has rejected Palestinian activist Mahmoud Khalil's latest attempt to halt his deportation, pushing the former Columbia University graduate student significantly closer to the possibility of being re-arrested and expelled from the United States. The Board of Immigration Appeals issued a final order of removal against Khalil on Thursday, according to his legal team. The board's decisions are not made public, and the U.S. Department of Justice had not responded to requests for comment at the time of reporting, as per the Associated Press. Khalil said the outcome did not catch him...