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While President Donald Trump rattles sabers on Twitter and slams "Rocket Man" Kim Jong Un, there is also a perceptible hardening of tone among senior officials.

**This image is for use with this specific article only.**

While President Donald Trump rattles sabers on Twitter and slams "Rocket Man" Kim Jong Un, there is also a perceptible hardening of tone among senior officials.

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Trump: My nuclear button is bigger than Kim's

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Trump: My nuclear button is bigger than Kim's

President Donald Trump responded to North Korean Leader Kim Jong Un with a tweet warning that his "nuclear button is on his desk at all times." Rep. Jim Himes discusses the tweet with CNN's Anderson Cooper.

Source: CNN

North Korea Tensions (15 Videos)

**This image is for use with this specific article only.**

While President Donald Trump rattles sabers on Twitter and slams "Rocket Man" Kim Jong Un, there is also a perceptible hardening of tone among senior officials.

Trump: My nuclear button is bigger than Kim's

north korea kim jung un new year speech hancocks lklv_00005209.jpg

Kim Jong Un delivers New Year's address

This photo from North Korea's official Korean Central News Agency (KCNA) taken on December 23, 2017 and released on December 24, 2017 shows North Korean leader Kim Jong-Un during the 5th Conference of the Workers' Party of Korea Cell Chairpersons.
/ AFP PHOTO / KCNA via KNS / - / South Korea OUT / REPUBLIC OF KOREA OUT ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO/KCNA VIA KNS" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS
THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / (Photo credit should read -/AFP/Getty Images)

North Korea may test missile in new year

The Lighthouse Winmore, chartered by Taiwanese company Billions Bunker Group Corp., is seen at sea off South Korea's Yeosu port on December 29, 2017.
South Korea briefly seized and inspected a Hong Kong-registered ship in November for transferring oil products to a North Korean vessel and breaching UN sanctions, a foreign ministry official said on December 29. / AFP PHOTO / YONHAP / - / - South Korea OUT / REPUBLIC OF KOREA OUT NO ARCHIVES RESTRICTED TO SUBSCRIPTION USE -/AFP/Getty Images

China accused of letting oil into North Korea

Images of the North Korea missile launch on November 28 taken from Rodong Sinmun, North Korea's official newspaper.

Officials: Signs NK is prepping missile launch

ghost ships of NK watson pkg_00001324.jpg

North Korean 'ghost ships' washing up in Japan

North Korean soldiers (R) look at the South side while US Vice President Mike Pence (not pictured) visits the truce village of Panmunjom in the Demilitarized Zone (DMZ) on the border between North and South Korea on April 17, 2017.
Pence arrived at the gateway to the Demilitarised Zone dividing the two Koreas, in a show of US resolve a day after North Korea failed in its attempt to test another missile. / AFP PHOTO / JUNG Yeon-Je (Photo credit should read JUNG YEON-JE/AFP/Getty Images)

What it's really like to be inside North Korea

PAJU, SOUTH KOREA - JANUARY 08: A sunrise is seen through a barbed-wire fence at the Imjingak, near the Demilitarized zone (DMZ) separating South and North Korea on January 8, 2016 in Paju, South Korea. South Korea announced on January 7th that it would resume the broadcasts from loudspeakers placed along the border, criticizing the North in response to its nuclear test. In August, 2015, when South Korean soldiers were maimed by land mines in the DMZ, South Korea started the loudspeaker broadcasts and the North threatened to attack the speakers. (Photo by Chung Sung-Jun/Getty Images)

North Korean soldier defects across the DMZ

Police accuse man of acting as N. Korean agent

north korea missile launch newton_00000629.jpg

Watch North Korea's huge new missile launch

The second most powerful official after Kim Jong Un has not been seen in a couple of months. Has General Hwang Pyong So been purged.. or even executed?

North Korean high-ranking official missing

In this Sept. 3, 2017, image distributed on Monday, Sept. 4, 2017, by the North Korean government, North Korea's leader Kim Jong Un holds a meeting of the ruling party's presidium. North Korea claimed a "perfect success" for its most powerful nuclear test so far, a further step in the development of weapons capable of striking anywhere in the United States. Independent journalists were not given access to cover the event depicted in this image distributed by the North Korean government. The content of this image is as provided and cannot be independently verified. (Korean Central News Agency/Korea News Service via AP)

Kim Jong Un: What we know about him

Tillerson: We do not accept N. Korea's path

Why does North Korea keep launching ICBMs?

How much damage can North Korea's weapons do?

North Korea's regime has "succeeded in making a more developed nuke," according to state news agency KCNA. During a visit to the country's Nuclear Weapons Institute "he watched an H-bomb to be loaded into new ICBM," KCNA added.

The weapon that makes N. Korea more dangerous

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Trump: My nuclear button is bigger than Kim's

Anderson Cooper 360

President Donald Trump responded to North Korean Leader Kim Jong Un with a tweet warning that his "nuclear button is on his desk at all times." Rep. Jim Himes discusses the tweet with CNN's Anderson Cooper.

Source: CNN

**This image is for use with this specific article only.**

While President Donald Trump rattles sabers on Twitter and slams "Rocket Man" Kim Jong Un, there is also a perceptible hardening of tone among senior officials.

JUST WATCHED

Trump: My nuclear button is bigger than Kim's

Replay

More Videos ...

MUST WATCH