Pena Nieta was to be sworn in under tight security, with with metal walls around congress and some 6,500 police officers deployed on the street.
Protesters plan to demonstrate around congress while the second-place finisher in the July 1 election, Andres Manuel Lopez Obrador, leads a rally at the downtown Angel of Independence monument.
Lopez Obrador has refused to accept defeat, charging that the PRI bought votes to secure victory. However, the electoral tribunal threw out his claim.
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