The addition of North Korea and Venezuela broadens the restrictions from the original, mostly Muslim-majority list.
"North Korea does not cooperate with the United States government in any respect and fails to satisfy all information-sharing requirements," the proclamation said.
An administration official, briefing reporters on a conference call, acknowledged that the number of North Koreans now traveling to the United States was very low.
https://www.cnbc.com/2017/09/24/white-house-issues-updated-travel-ban-with-fresh-restrictions-on-who-can-enter-us.html