List of Provisional Presidents of the Argentine Senate. The Provisional President of the Senate is the highest-ranking official in the Upper House barring the presence of the titular President of the Senate, the Vice President of Argentina. The Provisional President of the Senate is second in the line of succession to the Presidency in Argentina. This official is elected by his or her peers at the outset of each legislative year, which per governing statutes takes place during the first ten days of December. Minority parties in the chamber elect three Vice Presidents.