The former security minister’s announcement follows a week of opposition infighting

City mayor said he’d apply the measures nationally if he wins the elections

“I believe that we have to dynamite almost everything”

Changes to ballots in Buenos Aires were welcomed by coalition partners but rejected by his own party

The move heightens tensions within the opposition, putting him at odds with party-mate Mauricio Macri

Press rumours prompted Macri to accuse Larreta of “changing the rules”

The coalition would unite JxC and liberal parties