In this 2016 photo, a man holds up his iPhone during a rally in support of data privacy outside the Apple store in San Francisco. Watchdog groups that keep tabs on digital privacy rights are concerned that U.S. Customs and Border Protection agents are searching the phones and other digital devices of international travelers at border checkpoints in U.S. airports.

In this 2016 photo, a man holds up his iPhone during a rally in support of data privacy outside the Apple store in San Francisco. Watchdog groups that keep tabs on digital privacy rights are concerned that U.S. Customs and Border Protection agents are searching the phones and other digital devices of international travelers at border checkpoints in U.S. airports.