This is not a ban on refugees from Muslim countries. It's neither a ban, nor targeting refugees, nor limited to Muslim countries.
It's a 90 day suspension of immigration from countries described by 8 U.S.C. 1187(a)(12), specifically:
* Iraq and Syria
* Governments which have repeatedly provided support of acts of international terrorism
* Countries or areas of concern designated by the Secretary of Homeland Security
https://www.nytimes.com/2017/01/27/us/politics/refugee-musli...