Countries issue travel warnings for travelers headed into the U.S.

Several countries are warning their citizens and residents about traveling into the United States. Canada, Britain and Germany, among others, have updated their travel advisories. While they are not warning against traveling to the U.S., they are warning people to be extra careful and to follow all entry rules, or they could risk being detained. There are several stories floating around in recent weeks, in which Customs and Border Protection agents have been denying travelers of entry into the U.S. after searching through their phones.