Bangladesh, June 22 -- Abelardo de la Espriella, the right-wing lawyer and populist politician known for his hardline stance on crime and corruption, has declared victory in Colombias fiercely contested presidential election, setting the stage for a tense political and legal confrontation as official results remain uncertified.

The self-styled “Tiger,” who built his campaign around promises of restoring security and strengthening state authority, addressed supporters late Sunday night after preliminary vote counts showed him narrowly ahead of his left-wing rival, Senator Iván Cepeda. While de la Espriella celebrated what he described as a historic victory, the incumbent administration and Cepedas campaign have refused to...