Andres Manuel Lopez Obrador, who finished second in the July 1 presidential election, ripped the Spanish daily El Pais for referring to him in an editorial as a "burden" for Mexico's left and told the newspaper to stop engaging in "colonialist journalism."
"To El Pais: drop the habit of engaging in colonialist journalism," Lopez Obrador said in a Twitter posting.
The former Mexico City mayor did not stop there, however, accusing the newspaper of being responsible for Spain's economic crisis.
"You are better off doing some self-criticism over your responsibility in Spain's disaster," Lopez Obrador said.
Institutional Revolutionary Party, or PRI, candidate Enrique Peña Nieto won Mexico's presidency with 38.21 percent of the vote, while Lopez Obrador took second place with 31.59 percent, according to the final official results released by the Federal Electoral Institute, or IFE.
El Pais, Spain's largest newspaper, said in an editorial published Sunday and titled "Obrador es un lastre" (Obrador Is a Burden) that the Mexican politician was a "populist" and "has always been a sore loser."
Lopez Obrador lost the 2006 presidential election to Felipe Calderon, of the National Action Party, or PAN, by 0.56 percent and has never recognized the results, claiming victory in the contest and declaring himself "president-elect."
The leftist politician is challenging the results of this year's presidential election, a move that El Pais called "unlikely" to succeed.
"The Mexican left has been frustrated since 1988 in its efforts to reach the presidency. For Lopez Obrador's supporters, it appears the time has come to ask themselves if it is worth it to have as a leader a man who has been defeated twice, with a tendency toward conspiratorial victimization and whose abrasive and stiff style has lost a part of his natural vote," the editorial said.
Lopez Obrador's Party of the Democratic Revolution, or PRD, has leaders, such as former Mexico City Mayor Marcelo Ebrard and his successor, Miguel Angel Mancera, who are "pragmatic and good speakers, who do not get rejected by voters and are much more in touch with the realities of today's Mexico," El Pais said. EFE