"The EU nations impacted include: Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, and Switzerland.

This is a prudent step because these are EU nations, under their collective assembly, who permit unrestricted travel without border enforcement or containment measures."

https://theconservativetreehouse.com/2020/03/11/president-trump-suspends-entry-from-eu-schengen-area-outline-of-travel-restrictions/