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Trump, South Korean president to speak

South Korean army's K-1 tanks move during a military exercise in Paju, South Korea, near the border with North Korea, Monday, Sept. 4, 2017. Following U.S. warnings to North Korea of a "massive military response," South Korea's military on Monday fired missiles into the sea to simulate an attack on the North's main nuclear test site a day after Pyongyang detonated its largest ever nuclear test explosion. (AP Photo/Ahn Young-joon)
South Korean army's K-1 tanks move during a military exercise in Paju, South Korea, near the border with North Korea, Monday, Sept. 4, 2017. Following U.S. warnings to North Korea of a "massive military response," South Korea's military on Monday fired missiles into the sea to simulate an attack on the North's main nuclear test site a day after Pyongyang detonated its largest ever nuclear test explosion. (AP Photo/Ahn Young-joon) South Korean army's K-1 tanks move during a military exercise in Paju, South Korea, near the border with North Korea, Monday, Sept. 4, 2017. Following U.S. warnings to North Korea of a "massive military response," South Korea's military on Monday fired missiles into the sea to simulate an attack on the North's main nuclear test site a day after Pyongyang detonated its largest ever nuclear test explosion. (AP Photo/Ahn Young-joon)

WASHINGTON (AP) – President Donald Trump is scheduled to speak with South Korean President Moon Jae-on Monday amid intensifying tensions with North Korea.

The call comes as the U.N. Security Council is holding its second emergency meeting in a week about North Korea after the country said it detonated a hydrogen bomb underground Sunday.

Defense Secretary Jim Mattis on Sunday said the U.S. will answer any threat from the North with a “massive military response.”

Trump has also threatened to halt all trade with countries doing business with the North, a veiled warning to China. He also faulted South Korea for its “talk of appeasement.”