Upon being notified by the Secretary of Transportation that the Secretary has determined that a condition exists that threatens the safety or security of passengers, passenger vessels, or crew traveling to or from a foreign port which the Secretary of Transportation has determined pursuant to section
1803
(d) of this Appendix to be a port which does not maintain and administer effective security measures, the Secretary of State shall immediately issue a travel advisory with respect to that port. The Secretary of State shall take the necessary steps to widely publicize that travel advisory.