President Donald Trump warned North Korea on Tuesday that any U.S. military option would be "devastating" for Pyongyang, but said the use of force was not Washington's first option to deal with the country's ballistic and nuclear weapons program.

"We are totally prepared for the second option, not a preferred option," Trump said at a White House news conference, referring to military force. "But if we take that option, it will be devastating, I can tell you that, devastating for North Korea. That's called the military option. If we have to take it, we will."

Bellicose statements by Trump and North Korean leader Kim Jong Un in recent weeks have created fears that a miscalculation could lead to action with untold ramifications, particularly since Pyongyang conducted its sixth and most powerful nuclear test on Sept. 3.