The head-scratching over President Trump's reference on Saturday to a Friday night incident in Sweden is moving up the chain. Reuters reports the Swedish embassy in Washington has asked the State Department to explain what Trump meant when he said, "You look at what's happening in Germany. You look at what's happening last night in Sweden. Sweden. Who would believe this? Sweden. They took in large numbers. They're having problems like they never thought possible."
The AP reports that Sweden last recorded a terror-related incident in December 2010, when an Iraqi-born Swede set off two explosive devices in Stockholm; the perpetrator was the only one to die. As for what Trump was referencing at his Florida rally on Friday, "We are trying to get clarity," Swedish foreign ministry rep Catarina Axelsson tells Reuters. Here are some theories about what may have been at the root of Trump's comment. (Read more President Trump stories.)