Harvard University has sued the Trump administration over its decision to block the enrollment of international students. In a federal lawsuit filed in Boston, Harvard calls the move unconstitutional retaliation for defying political pressure. The school warns the action would devastate its global student body, which includes nearly 6,800 students from over 100 countries. The Department of Homeland Security accused Harvard of allowing anti-American behavior and alleged ties to China. Harvard seeks a restraining order while vowing to protect its core values and respond to allegations later.