Story highlights Gen. John Hyten shared what would happen if he were ordered to launch a nuclear strike

Senate hearing this week focused on the presidential authority to launch nuclear weapons

Washington (CNN) The top US nuclear commander said Saturday he would push back against an order from President Donald Trump for a nuclear strike if it were "illegal."

Speaking at the Halifax International Security Forum in Nova Scotia, Canada, Gen. John Hyten, who is the commander of US Strategic Command, shared what would happen if he were ordered to launch a nuclear strike.

"I provide advice to the President," Hyten said. "He'll tell me what to do, and if it's illegal, guess what's going to happen? I'm gonna say, 'Mr. President, that's illegal.' Guess what he's going to do? He's going to say, 'What would be legal?' And we'll come up with options of a mix of capabilities to respond to whatever the situation is, and that's the way it works. It's not that complicated."

US Strategic Command oversees US nuclear weapons and missile defense.

Hyten's remarks come after a Senate Foreign Relations Committee hearing this week on the President's authority to launch nuclear weapons -- the first such congressional hearing in more than 40 years.

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