Hostility at the US Border Chills Vacation Spending From Allies

Days into President Donald Trump’s second term, a German woman crossing into America from Mexico was held by US Immigration and Customs Enforcement for more than a month. A few weeks later, a Canadian actress was kept for 12 days in detention centers on the southern border after bureaucratic troubles over a work visa. A French scientist on his way to an astronomy conference was detained at the airport in Houston for a day and ordered to return home.

Friction at the US border, especially disagreements over paperwork, isn’t strange on its own, say overseas diplomats. But the harshness ...