On Friday, President Trump indefinitely stopped all Syrian refugees from entering the United States and temporarily suspended the entire refugee program.
The executive order doesn't explicitly say "Islam" or "Muslim," but it does block anyone from Yemen, Libya, Somalia, Sudan, Iran, Syria, and Iraq from entering the US for the next 90 days.
Celebrities and countless others on Twitter are now protesting against the executive order by using the hashtag #MuslimBan.