WASHINGTON President Donald Trumps executive order targeting Muslims and refugees led to chaos in the hours after he signed it, as refugees and immigrants arrived at U.S. airports only to be detained or told they couldnt enter the country and businesses had to scramble to adjust to the new policy.

We are hearing that last night a lot of people were turned away, said Abed Ayoub, legal director of the American-Arab Anti-Discrimination Committee. Its had a direct impact on a lot of people.

The order, which Trump signed Friday afternoon , bans Syrian refugee resettlement in the U.S. indefinitely. It will also shut down the entire refugee program for 120 days and bar all immigrants and visitors from seven Muslim-majority countries Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen from entering the U.S. for at least 90 days.

The order goes far beyond refugees or tourists it means that about 500,000 green card holders who reside in the U.S. but are originally from one of the seven countries will need a waiver to return to their homes, White House officials said Saturday. It also applies to people from the seven countries who hold dual citizenship and are not U.S. citizens. This means that people of both French and Yemeni nationality, for example, would be denied entry.

Coming in the late hours of Friday, and with little apparent consultation with other agencies and groups prior to its publication, the presidents order has created havoc and confusion among those tasked with overseeing entry into the country, to say nothing of the people actually trying to enter the U.S.