The first ban was most certainly not only illegal immigrants, it was legal immigrants such as green card holders and even on dual-citizens from a number of countries. Specifically, the first ban also banned permanent residents from a number of countries (i.e. greencard holders.) Note that permanent residents have to pay US taxes even on income back home, even if living overseas. They are very much legal residents that have committed quite a bit of effort (and usually also funds) into becoming legal residents.

Reference: "It will bar green card holders," Gillian Christensen, acting Department of Homeland Security spokeswoman, said in an email.

http://www.reuters.com/article/us-usa-trump-immigration-gree...