Overcrowding plagues detention units amid Trump's immigration blitz / Detentions of Tourists and Visa-Holders Fuel Anxiety About Travel to U.S. / Tourist detentions at the US border: What international visitors should know / Detentions Of European Tourists At U.S. Borders Spark Fears Of Traveling To America / Germany 'monitoring' US detentions of its citizens / Columbia University student says his detention is indicative of anti-Palestinian racism in U.S. / Columbia University student and the U.S. government spar over his detention in Louisiana / German tourists' ordeal reportedly ending as they are returned from US detention / Georgia: Protester's detention extended in unprecedented closed hearing