Trump has defended the executive order, saying that it is “not a Muslim ban” and played down concerns that the order has to do with religion. “This is about terror and keeping our country safe,” Trump said.

National security experts have criticized the president for alienating U.S. allies such as Iraq, where Iraqi interpreters who worked with U.S. troops previously have been given special visa preferences in the past.

The Pentagon launched an effort over the weekend to give them special consideration. On Tuesday, DHS clarified its stance and said special immigrant visa holders will be treated the same as green card holders. These individuals will now be allowed to board their flights to the U.S.

Those who frequently travel back and forth to the United States — such as business executives — will face another restriction: the suspension of the Visa Interview Waiver Program. The program allowed individuals to skip the in-person interview process at a U.S. consulate or embassy if they renew their visa often.

Now, repeat applicants who apply for a new visa must appear for an in-person interview.