A Norwegian tourist says immigrant agents have refused to enter the United States after suffering a problem with vice president JD Vance by phone.
US national security officials say they have been accused of acknowledging the use of drugs.
Jake Horton of the BBC Verify has told Mads Mikkelsen about his experience and examines the law to reject tourists in the United States.
BLANCA ESTRADA and Meiying Wu were produced. Graphic of Leo Scutt-Richter.