A US judge has ruled the Trump administration can deport Mahmoud Khalil, a Columbia University graduate detained last month over his role in pro-Palestinian protests. Mr Khalil, a permanent legal US resident, has not been charged with a crime. In a letter written from the facility, he has said his "arrest was a direct consequence" of speaking out for Palestinian rights. The government has cited a Cold War-era immigration law, declaring that his presence in the US was adverse to...