The US State Department has ordered enhanced social media screening for student and exchange visitor visa applicants in an effort to prevent critics of the US and Israel from entering the country. The screening applies to those suspected of having terrorist ties or sympathies, as well as those who have participated in pro-Palestinian protests. The cable sent by US Secretary of State Marco Rubio outlines the process foreign service officers must follow when reviewing visa applications, including addressing any derogatory information related to terrorism. Rubio has already revoked at least 300 visas since taking office in January.