The Homeland Security Department is suspending a program that lets prescreened Chinese nationals visit the Northern Mariana Islands without a visa for up to 14 days.

The change takes effect Friday, October 30, at 2 p.m. Eastern and covers both new applicants and travelers with existing approvals. Those already lawfully in the territory may finish their authorized stays.

DHS cited national-security, immigration and law-enforcement concerns while it reviews the program.