The Colombian Presidential election of 1986 was held in two rounds, first on May 25 and the second on June 15. Due to a growing economy, Colombia's successful entry into the nuclear club and the turning tide of the Brazilian War, the second round saw incumbent President and Republican Party candidate Rafael Gusto Villana defeat Chairman of the Senator Mario Reyes of the Social Party with 63.5% of the vote after just narrowly failing to achieve a majority in the first round, giving Villana a full term after having only served roughly three-fourths of the prior Presidential term.