Germany’s Foreign Office advises travelers to carry documentation showing their return plans and to be prepared for questioning at the border. Travelers who encounter issues are urged to contact the U.S. Department of Homeland Security upon their return. The U.S. State Department said it would enforce visa rules and other conditions of entry.

The United Kingdom updated its advice for travel to the United States on Thursday, warning of harsh consequences for British passport holders who violate U.S. immigration laws. The notice comes