From The Washington Post:

“It sends a message of toothlessness,” Paul Rosenzweig, a former top cybersecurity official at the Department of Homeland Security during the George W. Bush administration, told me. “If I threaten to send you to jail but I never actually do it, what message does that send?”

Rosenzweig criticized Trump officials for launching the ban before they were prepared to implement it and speculated it could be more than a year before the ban fully takes effect. “The right way to do this would have been to prepare everything in advance and announce it with an implementation date in 30 days. But that isn’t what we did. The announcement, like so many things, was done impulsively,” said Rosenzweig, a senior national security and cybersecurity fellow at the conservative-leaning R Street Institute think tank.