Mexico's new President Enrique Pena Nieto pledged Saturday to reduce the poverty and violence plaguing his country after a rowdy swearing-in ceremony marked by protests inside and outside Congress.

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Enrique Pena Nieto was finally declared Mexico's president-elect on Friday after a two-month legal fight, but his leftist rival refused to accept the result and called for a rally.

Enrique Pena Nieto, the new face of the party that governed Mexico for seven decades, won Sunday's presidential election by a wide margin, according to exit polls carried by local media.

Pena Nieto,