In the event that Trump decided to launch a nuclear attack, Hyten would provide him with strike options that are legal.
The command would control nuclear forces in a war.
The comments come as the threat of nuclear attack from North Korea remains a serious concern and Trump's critics question his temperament. Trump's taunting tweets aimed at Pyongyang have sparked concerns primarily among congressional Democrats that he may be inciting a war with North Korea.
During testimony before the Foreign Relations Committee earlier this month, retired Gen. Robert Kehler who served as the head of Strategic Command from January 2011 to November 2013, also said the U.S. armed forces are obligated to follow legal orders, not illegal ones.
Hyten said he's talked it over with Trump.
"I think some people think we're stupid. We're not stupid people. We think about these things a lot. When you have this responsibility how do you not think about it?,' he said.
He said he would not obey an illegal order.
"You could go to jail for the rest of your life," he said.
-AP