This is fake news, generated to try to make Trump look unhinged.
If any government employee is asked the question, “If the President asked you to do something illegal, would you do it?” The answer is obviously, “No.”
This is just sensational because we are talking about nukes.
If the President asked you to do something illegal, would you do it? The answer is obviously, No.
How can a president given an illegal order for a nuclear strike?
The point is the general was stupid for allowing himself to be drawn into a discussion of this type. He was not asked in he would follow an order that was illegal. He was commenting on what HE thought was illegal, and in this case, a nuclear strike, of all things.