Óscar Arias Sánchez, the Nobel laureate and former Costa Rican president, has had his visa revoked by the United States with no reason given. He is a vocal critic of President Trump and is the latest in a string of individuals who have had their visas canceled or been denied entry due to their 'hostile attitudes' toward the U.S. The U.S. State Department and the Costa Rican government have not commented on the situation. Mr. Arias has been critical of the Trump administration on social media and believes the revoking of his visa may be a form of punishment.