"... that discriminates against people because of their national origin..."  Doug, I hate to break it to you, but immigration LAWS discriminate against people from nations other than ours.  Duh!

http://www.foxnews.com/us/2017/03/06/300-refugees-subjects-fbi-terror-investigations-u-s-officials-say.html

For those of you who frequently ask questions, here's the link to dhs' faq:

https://www.dhs.gov/news/2017/03/06/qa-protecting-nation-foreign-terrorist-entry-united-states

To make it even easier (Doug), I would direct the readers' attention specifically to questions 3, 7, 8, 10, 16, 18, 21, 24, 32, and 34.

Of note in the 2nd para of question 33 provided for you here states:

"Congress and the OBAMA ADMINISTRATION [emphasis added] designated these six countries as countries of concern due to the national security risks associated with their instability and the presence of terrorist fighters in their terrortories."  [I purposely misspelled territories =o}