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EAST COAST, SOUTH KOREA - SEPTEMBER 4: In this handout photo released by the South Korean Defense Ministry, South Korea's Hyunmu-2 ballistic missile is fired during an exercise aimed to counter North Korea's nuclear test on September 4, 2017 in East Coast, South Korea. South Korea's military said Monday it conducted a combined live-fire exercise in response to North Korea's sixth nuclear test a day earlier.  (Photo by South Korean Defense Ministry via Getty Images)
EAST COAST, SOUTH KOREA - SEPTEMBER 4: In this handout photo released by the South Korean Defense Ministry, South Korea's Hyunmu-2 ballistic missile is fired during an exercise aimed to counter North Korea's nuclear test on September 4, 2017 in East Coast, South Korea. South Korea's military said Monday it conducted a combined live-fire exercise in response to North Korea's sixth nuclear test a day earlier.  (Photo by South Korean Defense Ministry via Getty Images)

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Leaders warn against strike on North Korea

Former US military leaders are warning President Trump about the dangers of a first strike on North Korea, asking him to exhaust all diplomatic measures first. CNN's Brian Todd reports.

Leaders warn against strike on North Korea

Former US military leaders are warning President Trump about the dangers of a first strike on North Korea, asking him to exhaust all diplomatic measures first. CNN's Brian Todd reports.