The scientist was reportedly detained in China along with other nine defectors and sent back to North Korea last month.
Jenkins had been in North Korea for 15 years when the regime brought Hitomi Soga to live with him.
The Katalexa yacht was returning from Japan when it was commandeered by North Korea.
"It's very rare that the United States prohibits travel to a country. We don't take a nanny-state approach."
Otto Frederick Warmbier, 21, was in North Korea for a five-day New Year trip and was detained at Pyongyang airport.
Joo Won-moon tells CNN he doesn't know what charges he might face.