Argentine politician Sergio Massa, who recently pledged his support to the main opposition challengers to President Mauricio Macri, is in line to play a key role in the country's Congress if his new allies win national elections later this year.
The former chief of staff said on Tuesday he would be the first on a list of candidates to lead the Chamber of Deputies, one of the country's two houses of Congress, if Peronist hopeful Alberto Fernandez wins the presidency.
Massa, a centrist politician who had himself eyed a presidential run, struck an alliance last week with Fernandez and his unrelated running mate Cristina Fernandez de Kirchner, who served as president from 2007 to 2015.
The alliance - which had raised the question of what role Massa would take - is expected to widen the appeal of the Fernandez-Fernandez ticket to more moderate voters, particularly in the key province of Buenos Aires.
Beyond my personal interest, our biggest responsibility is to give Argentines the possibility to build a majority to have a new government, Massa said during a seminar in Buenos Aires.
The Fernandez-Fernandez pairing will take on center-right leader Macri in elections in October. If no candidate wins 45% of votes in the first round of voting - or wins at least 40% with a 10 percentage point margin over the second-place finisher - the race will go to a runoff in November.
Macri, who has been hit hard in the polls by a painful economic recession and market volatility, will seek re-election with running mate Miguel Ángel Pichetto, another moderate Peronist.