Story highlights Iran calls Trump's order "an obvious insult to the Islamic world"

Iran is one of seven Muslim-majority nations targeted in US order

(CNN) Iran is carefully studying US President Donald Trump's executive order limiting immigration from seven Muslim-majority countries and will take legal, political and reciprocal measures accordingly, Iran's Foreign Affairs Ministry announced Saturday.

Iranian Foreign Minister Javad Zarif didn't specify what those measures would be, but he affirmed in a tweet that anyone with a valid visa would be welcomed.

"Unlike the U.S., our decision is not retroactive. All with valid Iranian visa will be gladly welcomed. #MuslimBan 7/7" he wrote.

Unlike the U.S., our decision is not retroactive. All with valid Iranian visa will be gladly welcomed. #MuslimBan 7/7 — Javad Zarif (@JZarif) January 28, 2017

Iran is among seven countries whose nationals are barred from entering the United States for 90 days under Trump's order, signed Friday.

Earlier, CNN and some other media organizations reported that Iran was banning Americans from entering the country. The foreign affairs ministry says it is considering what action to take.