How the White House may respond to China and North Korea

ABC News' Jon Karl reports on the White House's diplomatic efforts with China to help find a peaceful resolution to mounting tensions with North Korea.
1:40 | 04/21/17

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Transcript for How the White House may respond to China and North Korea
Now to that war of words with North Korea the rogue nation warning of a quote. Super mighty preemptive strike based state would reduce forces in South Korea and the US ashes. China now putting some of its bombers on heightened alert and our chief White House correspondent Jonathan Karl has all of those latest developments good morning John. Good morning Amy that's quite a threat from the north Koreans to reduce US forces to add. Ashes but just a short while ago Defense Secretary James Mattis dismissed the threat is the kind of thing. The north Koreans have been saying for decades but there is no question the US is on heightened alert the big. Biggest concern right now. Are indications the north Koreans are preparing to conduct a nuclear test that would be the first nuclear test by North Korea since Donald Trump became president and a significant escalation of this crisis. And don't we know the White House is moving that aircraft carrier into the region and president from touting military deterrence to North Korea but is there any sign up a diplomatic solution. The big diplomatic push is with China. That this administration trying to get China to put more pressure on North Korea and yesterday the president said there are indications that China is stepping up. I can say that all of the pundits out there are saying they now have never have seen China work. Like you're working right now some very unusual moves have been made over the last two or three hours. So what was he talking about what those new moves the last two or three hours I asked the senior staff here at the White House we asked the Pentagon we asked the State Department nobody could or would tell us. But I could be that heightened alert status that those Chinese bombers were put on possibly in Aaron Jon Karl thank.

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

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