In a big crackdown, the Trump administration revoked the F-1 visas of over 300 international students for their alleged involvement in "campus activism" and "engagement with anti-national content" on social media. Hundreds of students woke up to emails sent by the US Department of State (DOS) informing them that their F-1 visas (student visas) have been revoked and that they should self-deport using the CBP Home App. US Secretary of State Marco Rubio announced that this crackdown would continue till "each and every lunatic is found". "Maybe more; it might be more than 300 at this point. We do it every day. Every time I find one of these lunatics, I take away their visa," US Secretary of State Marco Rubio told reporters at a press conference. He added, "Every country in the world has a right to decide who comes in as a visitor and who doesn’t." Also Read: Why Are Hundreds Of F-1 Visas Being Revoked In US And Should Indian Students Be Worried? What is an F-1 visa? An F-1 visa is a nonimmigrant student visa, and its primary purpose is to enable individuals to study in the United States at a full-time academic institution. The visa allows international students to enter the US to pursue studies at an accredited college, university, or other educational institution. To be eligible for an F-1 visa, you must be accepted into a program of study at an institution authorised by the US government to accept foreign students. It covers studies at accredited colleges, universities, seminaries, conservatories, academic high schools, elementary schools, or other academic institutions, and language training programs. F-1 students must maintain a full course of study and adhere to the rules and regulations outlined by the US government. Also Read: Indian Green Card Holders In US To Be Impacted Under Trump's New Proposal? As per the Trump administration's latest action, the social media activity will now be closely monitored for new student visa applicants across F (academic study), M (vocational study), and J (exchange) visa categories, and applicants will be barred from studying in the US if found to be supporting terrorist groups. Get Latest News Live on Times Now along with Breaking News and Top Headlines from US News, World and around the world.