This is not a ban on refugees from Muslim countries. It's neither a ban, nor targeting refugees, nor limited to Muslim countries.
Rudy Giuliani has now claimed on Fox News that he helped design the restrictions as a legally valid form of Trump's "Muslim ban":
https://www.washingtonpost.com/news/the-fix/wp/2017/01/29/tr...
Fox News host Jeanine Pirro asked Giuliani whether the ban had anything to do with religion.
“How did the president decide the seven countries?” she asked. “Okay, talk to me.”
“I'll tell you the whole history of it,” Giuliani responded eagerly. “So when [Trump] first announced it, he said, 'Muslim ban.' He called me up. He said, 'Put a commission together. Show me the right way to do it legally.' "