An Iranian citizen identified as a senior member of the country's Basij military force was caught trying to enter the United States posing as a cancer researcher, according to multiple sources familiar with the situation who told the Washington Free Beacon that the Trump administration should begin investigating how the individual was granted a U.S. visa in the first place. Seyed Mohsen Dehnavi, who has been identified as a member of Iran's highly vetted volunteer Basij force, was turned away from entering the United States at Boston's Logan Airport. Sources familiar with the situation said that Dehnavi is billing himself...