Cat Stevens aka Yusuf Islam was accused of making some bad choices, such as advocating for the death of Rushdie and helping support a Hamas paramilitary group. Although he claims he is innocent, that is why he was placed on the list. Which by the way, goes with not allowing Muslims who are seeking a safe haven from entering the U.S. You cannot have it both ways, not allow others into the country on the suspicion that they might be terrorists and then complain that we don't allow Yusuf Islam into the country after he admits to having given funds to Hamas group by mistake. Then you complain that the Orlando shooter was no longer under surveillance by an understaffed FBI so they could watch someone else due to a lack of evidence. Understaffed by the way, because congress won't increase their budget but expects them to cover more area.  The FBI has 12,700 field agents to watch 875,000 suspected terrorists.