President Donald Trump celebrated the arrest of a former graduate student at Columbia University, saying the detention of the Palestinian activist and legal United States resident was "the first arrest of many to come" on Monday. "Following my previously signed Executive Orders, ICE proudly apprehended and detained Mahmoud Khalil, a Radical Foreign Pro-Hamas Student on the campus of Columbia University," Trump wrote on Truth Social. "We know there are more students at Columbia and other Universities across the Country who have engaged in pro-terrorist, anti-Semitic, anti-American activity, and the Trump Administration will not tolerate it." Khalil was arrested at his...