Dr. William J. Parker appeared on Fox Business on May 25 to discuss the latest developments in efforts to denuclearize the Korean Peninsula, after U.S. President Donald Trump surprisingly canceled his planned meeting with North Korea's Kim Jong-un. The summit may reportedly still take place.

"These are very normal procedures for these types of negotiation," said Dr. Parker. "(North Korea) realized that (President Trump) is unpredictable and that is good when you're dealing with countries like North Korea."

President Trump, he added, also "is willing to leave all of the instruments of national power on the table and that's different from what we've seen in the past—diplomatic, information, military, economic, financial, intelligence and law enforcement."

Watch the May 25 interview.

On May 29, Dr. Parker joined the show again to discuss the topic further. The meeting is not the end game, he said. "This is a step towards denuclearization. I think this is the opportunity, though, to define what denuclearization is."

Watch the May 29 interview.

"North Korea - Pyongyang" (CC BY-SA 2.0) by Roman Harak