Trump threatens "fire and fury" if North Korea escalates threat
Trump responds to questions on North Korea
US stocks are at session lows after Trump responded to reports that North Korea has nuclear weapons small enough to fit on a missile.
"He has been very threatening," he said of Kim Jong-Un.
Trump warned North Korea "will be me met with fire and fury and, frankly, power the likes of which the world has never seen before."
Trump had previously said "it won't happen" about the possibility of North Korea achieving nuclear weapons that could hit this US.
If the report is correct, it may have already happened.