Transcript for North Korea reacts to canceled US summit

We want to turn to that canceled summit with North Korea. Overnight pyongng signaling it is still open to negotiations. This after president trump sent some mixed messages saying he too would estimate be willing to sit do while also threatening possible military action. Our chief white house correspondent Jonathan Karl is tracking it all. Good morning, Jon. Reporter: Good morning, Cecilia. The June 12th summit is off but the north Koreans issued a statement overnight saying that they want to try again. North Korea called president trump's decision to pull out of the summit unexpected and very regrettable. And urged him to come back to the table. We are willing to sit down with America at any time to solve the problem, the statement said adding that North Korea is, quote, willing to give the time and opportunity to the U.S. With a generous and open heart. Earlier before president trump abruptly canceled the summit, North Korea set off a barrage of explosions before visiting journalists claiming to destroy its nuclear test site in a gesture of goodwill. But the white house wasn't buying it. Releasing this letter from president trump to north Korean dictator Kim ng-un. Whom the president addressed as his excellency. We greatly appreciate your time, patience and effort, the president wrote, but due to North Korea's tremendous anger an open hostility I feel it is inappropriate at this time to have the long-planned meeting. Ifnd when Kim Jong-un chooses to engage in constructive dialogue and actions, I am waiting. Reporter: But he issued a dark warning in his letter to Kim. You talk about your nuclear capabilities, but ours are so massive and powerful that I pray to god they will never have to be used. Our military wch is by far the most powerful anywhere in the world that has been greatly enhanced recently, as you all know, is ready if necessary. Reporter: Could that mean war? Mr. President, does the breakdown of this summit raise the risk of war with north Korea? Well, we'll see what happens. Reporter: And as president trump pulled the plug on the summit he left open the possibility to get it back on track writing in that letter, Cecilia, if you Chang your mind please do not hesitate to call or write. That's what he wrote to Kim Jong-un. And we will see if that happens. Okay, Jon Karl, thank you. That summit had been on shaky ground for so long and when he called it off it was a complete bombshell to all of us in Washington. See if it happens. See if it happens.

This transcript has been automatically generated and may not be 100% accurate.