Mexico's electoral tribunal Thursday rejected a call by a defeated candidate to revoke the results of the July presidential elections.

Leftist leader Andres Manuel Lopez Obrador, a runner-up in the presidential election, has challenged the outcome following his lose to Enrique Pena Nieto of Institutional Revolutionary Party (PRI).

Electoral Tribunal of Federal Judicial Power, Mexico's highest election body, ruled that there was insufficient evidence to back the opposition's claim that the PRI was involved in votes buying and money laundering.

Nieto won presidential election on July 1st, returning his party to power after a 12-year hiatus. The opposition coalition Progressive Movement, however, claimed fraud and demanded a full recount.