WASHINGTON US Sen. Peter Welch demanded the release of a Palestinian student from Columbia University who was arrested Monday during a citizenship interview. "This is immoral, inhumane, and illegal. Mr. Mahdawi, a legal resident of the United States, must be afforded due process under the law and immediately released from detention," Welch said on X. His remarks came after Mohsen K. Mahdawi, a legal permanent resident and former leader of the campus protest movement, was taken into custody at