Mexican President Andres Manuel Lopez Obrador speaks during his morning press conference at the National Palace (Handout)Mexican President Andres Manuel Lopez Obrador on Wednesday vehemently rejected claims that drug traffickers helped to fund his first presidential campaign in 2006, describing the allegations as "completely false." Lopez Obrador also criticized US authorities for violating "political ethics" after the claims appeared in an article published on the ProPublica news site, which cited American officials. "It's slander... there's no evidence" of illegal financing, the Mexican president said at his regular morning news conference. The report said that it was unclear whether Lopez Obrador sanctioned or was even aware of the funding. Lopez Obrador rejected the claims as a political attack by his opponents ahead of presidential elections in June, which he hopes to see his close ally Claudia Sheinbaum win.