13 July 2012 Updated at 02:33 ET
Mexico election: Lopez Obrador challenges result
Mr Lopez Obrador wants the results of the vote to be thrown out
Mexico election
Mexico faces key reforms
Stand-off continues
Key issues
Q&A: Mexico election result
The runner-up in Mexico's presidential election, Andres Manuel Lopez Obrador, has filed a legal challenge to the result of the 1 July vote.
link-
http://www.bbc.co.uk/news/world-latin-america-18824607