The announcement made by the U.S. administration is that they can require information found on your devices for no legal grounds other than an understandable desire to protect homeland security, but with no legal grounds whatsoever. That applies to everyone and anyone, and it applies regardless of the security measures you have on your device. They say, “If you are to enter the United States, we can require that you give us your password or whatever security mechanism exists between us, the border officials, and the information we want to look at.”
On September 18th, 2017. See this statement in context.