The Trump administration suspended visa-free travel for Chinese nationals to the Northern Mariana Islands amid birth tourism and espionage concerns.
https://www.foxnews.com/politics/dhs-suspends-visa-free-travel-program-chinese-nationals-amid-birth-tourism-security-concerns
https://www.foxnews.com/politics/dhs-suspends-visa-free-travel-program-chinese-nationals-amid-birth-tourism-security-concerns