President Trump is doubling down on his warning to North Korea about "fire and fury."

Before a national security briefing at his golf resort in New Jersey yesterday, Trump said the threat "may not have been tough enough."

Trump said North Korea must "get their act together" or face trouble like few nations have ever encountered.

The president is sending a stern warning to North Korean leader Kim Jong Un about attacking Guam.

He said the U.S. response to a North Korean attack on Guam would be an event "the likes of which nobody's seen before, what will happen in North Korea."

He also said the U.S. is preparing for many different alternative events in North Korea. He said North Korea will not "go around threatening Guam," the U.S., Japan or South Korea. The President is vacationing at his golf resort in Bedminster.