Vice President Kamala Harris was forced to switch planes on her return trip from Europe on Saturday due to technical issues on Air Force Two.

Harris boarded a C-17 support plane Saturday afternoon following her speech at the Munich Security Conference in Germany.

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Vice President Kamala Harris speaks at Munich Security Conference

Vice President of the United States Kamala Harris waves while on stage to speak at the Munich Security Conference in Munich, Saturday, Feb. 18, 2023. (AP Photo/Michael Probst)

"Due to maintenance difficulties, the VP and the traveling party will depart Munich to Washington, D.C. on a back-up aircraft," a White House official told reporters.

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Vice President Kamala Harris poses with Britain's Prime Minister Rishi Sunak

Britain's Prime Minister Rishi Sunak and Vice President Kamala Harris pose as they meet at the Munich Security Conference in Munich, Feb. 18, 2023. (BEN STANSALL/POOL/AFP via Getty Images)

Harris met with Prime Minister Rishi Sunak of the United Kingdom this afternoon following her remarks at the Munich conference. She also briefly met with Prime Minister Ulf Kristersson of Sweden and Prime Minister Sanna Marin of Finland

The conference runs from Feb. 17-19 and gathers world leaders to discuss pressing international security issues, including the war in Ukraine.

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Harris announced in her conference address that the U.S. has officially determined that Russian forces have committed a series of crimes against humanity during their invasion of Ukraine.

 Finland's Prime Minister Sanna Marin, US Vice President Kamala Harris and Sweden's Prime Minister Ulf Kristersson

(L to R) Finland's Prime Minister Sanna Marin, Vice President Kamala Harris and Sweden's Prime Minister Ulf Kristersson pose for photographers at the Munich Security Conference in Munich, Feb. 18, 2023. (THOMAS KIENZLE/AFP via Getty Images)

"Long before I was vice president of the United States, I spent the majority of my career as a prosecutor, beginning as a young lawyer in the courtroom and later running the California Department of Justice," Harris said.

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She continued, "I know firsthand the importance of gathering facts and holding them up against the law. In the case of Russia's actions in Ukraine, we have examined the evidence. We know the legal standards. And there is no doubt these are crimes against humanity."