The U.S. Army soldier who crossed into North Korea earlier this week "may not have been thinking clearly," Army Secretary Christine Wormuth said. 

Wormuth was speaking at the Aspen Security Forum when she was asked about Pvt. Travis King, who was headed back to the United States after being released from a South Korean prison for assault when he joined a tour group heading to the heavily guarded Demilitarized Zone, known as the DMZ, that separates the two Koreas, which are still technically at war after signing an armistice in 1953. 

King was with the tour group when he abruptly crossed into the North, which is considered one of the world's most repressive nations. 

"He is a young soldier, he was facing consequences. I imagine he had a lot of negative feelings," Wormuth told NBC News Correspondent Courtney Kube. "He may not have been thinking clearly, frankly, but we just don’t know."

US SOLDIER SPRINTED INTO NORTH KOREA, EYEWITNESS THOUGHT IT WAS A TIKTOK ’STUNT’ 

U.S. Army Secretary Christine E. Wormuth speaking at a hearing

Secretary of the U.S. Army Christine E. Wormuth testifies during a Senate Appropriations Subcommittee on Defense hearing. On Thursday, Wormuth said the U.S. was trying to make contact with North Korea regarding Army Pvt. Travis King, who crossed into the repressive nation this week.  (Reuters)

King was headed to Fort Bliss in El Paso, Texas to face disciplinary charges from the Army when he failed to board his flight and joined the tour group instead. Wormuth said Washington has tried to make contact with Pyongyang through multiple channels but has not heard back. 

NORTH KOREA REMAINS UTTERLY SILET ON MISSING SOLDIER SUSPECTED OF CROSSING DMZ

American soldier Travis King

This undated photo shows Travis King, the American soldier who officials say currently is being detained in North Korea. (Facebook)

Wormuth said she was concerned about King's safety and well-being due to North Korea's history of mistreating American citizens, even those who have willingly defected to the communist regime. 

"What we want to do is get that soldier back into our custody. I worry about him, frankly," she said. "It makes me very, very concerned that Pvt. King is in the hands of the North Korean authorities. I worry about how they may treat him."

North Korea border crossing view

A group of tourists stand near a border station at Panmunjom in the Demilitarized Zone in Paju, South Korea, on Tuesday, July 18. Not long after this photo was taken, according to The Associated Press, Travis King, a U.S. soldier, bolted across the border and became the first known American detained in the North in nearly five years.  (AP/Sarah Jane Leslie)

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She noted the case of college student Otto Warmbier who was released by the North in 2017 while he was in critical condition. 

He died in a hospital six days after his return to the United States. Warmbier was detained after taking a propaganda poster from the hotel he was staying in and was accused of subversion.