Hundreds of Americans travel to North Korea each year, but they have only been allowed to do so with an organised tour group.
The United States issued a ban on Wednesday prohibiting its citizens traveling to North Korea, a move triggered by the death of a USA student imprisoned by Pyongyang during a tourist visit.
"I decided that maybe if I start naming people to office when they're 8 or 9 years old, they'll be of age by the time we can get them through the process", Tillerson joked.
"I don't expect to see that happen", Thornton told reporters ahead of Tillerson's trip.
Almost all Americans who have gone to North Korea have left without incident.
At least 16 USA citizens have been detained in North Korea in the past 10 years, and at least three are being held there now. I believe him. If I were China, I would believe him, too, and do something about it.
Chinese Foreign Minister Wang Yi issued similar comments at a press conference following Tillerson's remarks, stating that China "attached great importance" to his words and urged the United States to adopt "actual policy towards North Korea", without elaborating. "What we would expect to see this year at the meeting would be a general chorus of condemnation of North Korea's provocative behavior, and a pretty serious diplomatic isolation directed at the North Korean foreign minister".More news: HBO: Email System Likely Not Affected in Monday Hack Attack
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Earlier on Tuesday, a leading Republican senator, Lindsey Graham, said Trump had told him he was willing to go to war with North Korea "if they continued to try to hit America with an ICBM". "Only the North Koreans are to blame for this situation", he said.
The secretive North's leader, Kim Jong Un, supervised the midnight launch of the missile on Friday night and called it a "stern warning" to the United States that it would not be safe from destruction if it tried to attack, the official KCNA news agency said.
Tillerson also expressed his concerned toward Venezuela and says that if President Nicolás Maduro chose to leave office than United States will be pleased He tries his best to have a peace full relation with United State, North Korea, and Iran.
In response leader Kim Jong-un warned the United States it would not be safe from destruction if it tries to attack.
Wednesday's notice also comes amid extreme tension between the United States and North Korea.
The Russian foreign minister discussed with his USA counterpart the situation on the Korean Peninsula in light of the latest North Korean missile test. Former Secretary of State Henry Kissinger has proposed promising China that American troops will withdraw from South Korea following the collapse of the North Korean regime.
In all this the South Korean government has been completely sidelined.