The Justice Department accused Mahmoud Khalil, a pro-Palestinian activist at Columbia University who was detained by the Trump administration and had his visa revoked, of hiding his association with a controversial United Nations agency. 

Khalil covered up his employment by the United Nations Relief and Works Agency for Palestine Refugees in the Near East when he applied for his green card, the government alleged in a court brief filed in New Jersey on Sunday. He also withheld information from his visa application revealing he belonged to Columbia University Apartheid Divest, a pro-Palestinian student group, and worked for the Syria office in the British embassy in Beirut, the brief claimed.