Under U.S. immigration law, a green card can be revoked if the holder is found to have engaged in activities that threaten national security, support terrorism, or violate the terms of their residency. Similarly, a student visa can be canceled for criminal behavior or overstaying its purpose. The government’s case likely hinges on Section 212(a)(3) of the Immigration and Nationality Act, which bars individuals who have engaged in terrorist activities or are affiliated with terrorist organizations, broadly defined to include ideological support or incitement.