Federal agents arrested Palestinian activist Mahmoud Khalil

Federal agents arrested Mahmoud Khalil, a Palestinian activist and Columbia University graduate student, in a video released on Friday. The arrest occurred in his apartment building lobby, alarming free-speech advocates and his pregnant wife, Noor Abdalla. Khalil, a lawful U.S. resident, had his permission to stay revoked due to his involvement in pro-Palestinian protests. The Justice Department is investigating whether Columbia University concealed illegal immigrants on campus. Khalil's lawyers have challenged his detention, describing his treatment during arrest and transport. He is currently held in a detention center in Louisiana, concerned about missing the birth of his first child.