The two states have waged an unusual court battle over the agent facing charges over a shooting in Minneapolis. The agent could be released from jail on Thursday.
While the government says it is preventing an insurrection, activists and international observers have raised fears about arbitrary arrests and electoral fraud.
Zambian police officers watched as supporters of President-elect Hakainde Hichilema celebrated his victory in the street in the capital, Lusaka, on Tuesday.
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