Ominous war of words continue between Trump and North Korea's leader

Kim Jong Un says Trump "will pay dearly" for threatening North Korea during his speech at the United Nations.
2:24 | 09/22/17

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Transcript for Ominous war of words continue between Trump and North Korea's leader
Meantime next to the new threat from North Korea. Kim Jong-un saying president trump will quote, pay dearly for his speech. And North Korea with the hydrogen bomb test in the pacific. Here's Martha Raddatz tonight. Tonight a dramatic escalation of tensions. North Korea now threatening to test a hydrogen bomb above the pacific ocean. Their response to president trump. The United States has great strength and patience, but if it is forced to defend itself or its allies, we will have no choice but to totally destroy North Korea. Reporter: For months, the president's heated language has so far failed to stop Kim. 3 missile tests and an underground h-bomb test since trump warned of fire and fury. But detonating a nuclear bomb over the pacific would be Kim's most provocative move yet. A hydrogen bomb, a thermo nuclear weapon is going to have a lot of radiation. If it hits the water, there is going to be contamination for hundreds of miles around. Reporter: On gma, David continued to press secretary of state Rex tillerson about the us response. But if we see this detonation of an h-bomb in the pacific, what will the U.S. Do? Well, we will continue our efforts in the diplomatic arena but all our military options, as the president has said, are on the table. Reporter: The two leaders themselves, trading a volley of insults. Kim for the first time responding directly to trump, calling him "Mentally deranged." The president branding the north Korean dictator "A madman" who "Will be tested like never before." Martha you and I have both been talking to colonel Steve ganyard and now they're talng about testing a hydrogen baum in the pacific. Do they have the capability to pull that off? Reporter: They have already tested a hydrogen bomb and an intercontinental ballistic missile. We don't know for sure but this has to be taken seriously. This would be an extraordinarily alarming and dangers move and the administration would have to rethink what it is doing. All right.

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

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