mexico city mexico senate friday name country new top prosecutor election-related crimes official previously post fire amid graft scandal involve close former aide president enrique pena nieto hector marcos diaz lawyer academic long career mexico electoral body approve new prosecutor electoral crimes 92 senators vote senate say statement previous incumbent santiago nieto fire mexico act attorney general october ground break code conduct officials nieto give newspaper interview accuse emilio lozoya former boss state oil firm pemex senior member president 2012 campaign team write ask declare innocent funnel cash brazilian construction firm odebrecht pena nieto campaign odebrecht heart brazilian bribery kickback probe know lava jato car wash reverberate across latin america rule institutional revolutionary party pri try shake reputation graft threaten undermine party efforts stay power next july presidential election fire nieto widely see setback efforts pri oversee arrest various former state governors lozoya pose difficult challenge give proximity president pena nieto lozoya deny involvement wrongdoing relate 2012 campaign mexico 's senate pick new electoral prosecutor amid graft spat