Trump's envoy to South Korea sworn in

Retired Navy Adm. Harry Harris was sworn in on Saturday as the United States's new ambassador to South Korea, taking the role at a tumultuous time on the Korean Peninsula.

Harris, who previously served as the commander of U.S. forces in the Pacific, was confirmed by the Senate on Thursday in a voice vote.

Secretary of State Mike PompeoMichael (Mike) Richard Pompeo'China will not sit idly by' if US sells fighters to Taiwan, official says The Hill's Morning Report - Trump touts new immigration policy, backtracks on tax cuts Iceland's prime minister will not be in town for Pence's visit MORE congratulated Harris on his swearing in on Saturday, writing in a tweet that he has "a lot of work ahead" of him. 

Harris is taking on the role at a pivotal moment for U.S. involvement on the Korean Peninsula and in East Asia, more broadly.

His swearing in comes less than three weeks after President TrumpDonald John TrumpSarah Huckabee Sanders becomes Fox News contributor The US-Iranian scuffle over a ship is a sideshow to events in the Gulf South Korea: US, North Korea to resume nuclear talks 'soon' MORE met with North Korean leader Kim Jong Un in Singapore, marking the first face-to-face talks between a sitting U.S. president and North Korean premier in history.

During the summit, the two leaders signed a brief document committing the U.S. to unspecified security guarantees for the North in exchange for Pyongyang agreeing to the eventual denuclearization of the Korean Peninsula.

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Trump touted the agreement as a major success, declaring a day after the meeting that North Korea is "no longer a nuclear threat."

But an NBC News report on Friday appeared to cast doubt on whether the North is actually committed to denuclearization, saying that U.S. intelligence officials believe that the country has increased fuel production for nuclear weapons at several secret research facilities.