In a controversial new directive, Rubio Orders Visa Scrutiny for Harvard Visitors Amid Trump Crackdown on Higher Education. Secretary of State Marco Rubio has ordered U.S. embassies to apply heightened scrutiny to social media accounts of anyone seeking to visit Harvard University, citing national security concerns. The memo, issued Friday, suggests that a lack of public social media activity may be cause for visa denial, igniting backlash from immigration attorneys, civil rights groups, and higher education advocates.