Any foreign national coming to the US as who detains, retains or witholds custody in defiance of an order by a court in US is inadmissible.
Any alien who, after entry of an order by a court in the United States granting custody to a person of a United States citizen child who detains or retains the child, or withholds custody of the child, outside the United States from the person granted custody by that order, is inadmissible until the child is surrendered to the person granted custody by that order.
Any alien who is known by the Secretary of State to have intentionally assisted an alien in a child abduction, is known by the Secretary of State to be intentionally providing material support or safe haven to an alien child abductor, or is a spouse (other than the spouse who is the parent of the abducted child), child (other than the abducted child), parent, sibling, or agent of an alien child abductor, if such person has been designated by the Secretary of State at the Secretary’s sole and unreviewable discretion, is inadmissible until the abducted child is surrendered to the person granted custody by the order described in that clause, and such person and child are permitted to return to the United States or such person’s place of residence.
This clause shall not apply to a government official of the United States who is acting within the scope of his or her official duties or to a government official of any foreign government if the official has been designated by the Secretary of State at the Secretary’s sole and unreviewable discretion or so long as the child is located in a foreign state that is a party to the Convention on the Civil Aspects of International Child Abduction, done at The Hague on October 25, 1980.