Stephen Biegun was officially sworn in as deputy secretary of State on Saturday, becoming Secretary of State Mike Pompeo Michael (Mike) Richard PompeoWatchdog confirms State Dept. canceled award for journalist who criticized Trump Trump's push for win with Sudan amps up pressure on Congress Putin nominated for Nobel Peace Prize MORE’s No. 2 as the Trump administration faces challenges on a litany of foreign policy fronts.

“It's official: Stephen Biegun is the new Deputy Secretary of @StateDept. Honored to swear him in today. As I’ve said before, he’s exactly what we need to maintain our momentum executing a foreign policy that advances America’s interests and ensures our security,” Pompeo tweeted.

It's official: Stephen Biegun is the new Deputy Secretary of @StateDept. Honored to swear him in today. As I’ve said before, he’s exactly what we need to maintain our momentum executing a foreign policy that advances America’s interests and ensures our security. pic.twitter.com/e8AGVBAO8u — Secretary Pompeo (@SecPompeo) December 21, 2019

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Biegun, who previously served as the State Department’s envoy to North Korea, was confirmed to his new role by the Senate in a 90-3 vote on Thursday. He replaces John Sullivan, who now serves as U.S. ambassador to Russia.

Biegun has served in various posts in the executive and legislative branches throughout his career. He worked as a senior aide to then-national security adviser Condoleezza Rice under the George W. Bush administration and performed various national security advisory and staff roles on House and Senate committees.

He has been the Trump administration’s chief negotiator trying to broker an agreement with Pyongyang to curb its nuclear and missile programs. While the effort has been touted by President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE, negotiations between the two sides have stalled in recent months, with officials reportedly fearing a possible end-of-year missile test could further derail progress.

Biegun also takes over the State Department's No. 2 role as the administration works to negotiate a trade deal with China, officially implement a new trade deal with Mexico and Canada, defend the president over his dealings with Ukraine, and more.

In his new position, Biegun would also take over leadership of the department in an acting capacity should Pompeo decide to step down from his post to run for Senate next year in his home state of Kansas, a possibility Pompeo has been mulling.