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Two U.S. Secret Service agents who were working on Joe Biden's trip to Asia are being sent home after one was accused of drunkenly assaulting a South Korean the day before the president arrived in Seoul, officials said.

The two Secret Service employees went barhopping before returning to their hotel in a taxi, the official said. One of the employees got into an argument with the taxi driver and two Korean citizens who apparently were trying to enter the vehicle.

The incident occurred outside the Grand Hyatt hotel, where Biden stayed during his May 20-24 trip to South Korea and Japan. Biden arrived in Seoul on Friday evening.