Colombia's outgoing president, Gustavo Petro, has declared that he does not recognise the legitimacy of president-elect Abelardo de la Espriella, insisting that the June 21 presidential runoff was tainted by fraud — a claim unsupported by public evidence and directly contradicted by international observers and the official vote count.

In a lengthy post on social media platform X, Petro stated that, in his view, the rightful president-elect is left-wing senator Iván Cepeda, the candidate of his Historic Pact coalition. Official figures from Colombia's National Registry show that De la Espriella won the runoff with 49.66% of the vote — some 12.96 million ballots — against Cepeda's 48.70%, a margin of less than one percentage point. The result was confirmed by the National Electoral Council on June 24, the same day Cepeda conceded defeat. Despite his reservations, Petro agreed at that point to begin the formal handover process with the incoming team, which continues ahead of the transfer of power scheduled for August 7.

Petro has now sharpened his challenge, claiming that algorithms were run from a server with an IP address in Los Angeles to manipulate the vote count in De la Espriella's favour. He has offered no public evidence for the assertion. International election observers described the vote as orderly and transparent, the National Registry reported more than 99.9% correspondence between preliminary and final tallies, and judicial and oversight bodies have not engaged with the president's allegations. Separately, a former presidential ally, lawyer Luis Guillermo Pérez, is preparing a nullity lawsuit before the Council of State — Colombia's highest administrative court — that would seek to suspend the inauguration through a precautionary injunction. The action had not yet been formally filed as of Sunday.

Cepeda, while announcing a campaign of "civil disobedience" against the incoming administration, has in practice accepted the transition. Petro has also called for street demonstrations on July 20, Colombia's Independence Day, a date that traditionally draws large crowds. In response, figures close to De la Espriella have signalled possible legal action over alleged irregularities in the handover process, and some have raised the prospect of criminal proceedings against Petro himself.

The escalating dispute matters beyond Colombia's borders as a test of institutional resilience in a country that has long struggled with political polarisation. For now, the formal transition machinery remains on track, but Petro's refusal to fully acknowledge the result — and the threat of litigation aimed at blocking the August 7 inauguration — introduces a degree of uncertainty into what had appeared to be a settled, if narrow, democratic outcome.