A federal judge on Friday ruled that the Trump administration can deport Columbia University graduate student Mahmoud Khalil just a month after his arrest prompted national outrage and marked the start of the federal government’s broader crackdown on foreign students.

Columbia student activist Mahmoud Khalil was detained by federal agents in the lobby of his Manhattan apartment on March 8, the first arrest in President Donald Trump’s crackdown on pro-Palestinian activists.

New documents entered in a New Jersey court on Thursday show that the federal government defended its warrantless arrest of Columbia University student activist Mahmoud Khalil by saying agents feared he’d flee because he said he would leave the scene.