It is hard to know if this was an intentional lie or just plain stupidity. Both are quite common for the current occupant of the White House.

At a campaign rally on Sunday (yes, he’s still doing campaign rallies – I guess even he doesn’t believe he really won) Donald Trump said, “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.”

Of course nothing happened in Sweden. But he and his staff work very hard to make sure everyone is very, very scared so that he can chip away at the freedoms our Constitution guarantees us. His administration has a very strong record of making up crime and terrorism events and statistics.

http://www.politifact.com/truth-o-meter/statements/2017/feb/19/donald-trump/donald-trump-florida-rally-laments-attack-last-nig/