"We have a mountain of documents," Lasso told reporters on Wednesday, as quoted by the TeleSUR broadcaster, referring to evidence of alleged election fraud. He demanded a "vote by vote" recount, challenging hundreds of allegedly faulty electoral rolls.
The second round of Ecuador's presidential elections was held on Sunday.
With over 99 percent of the votes processed, Lenin Moreno, a candidate from Ecuador’s ruling PAIS Alliance, has over 51 percent of the votes, while Lasso has 48.85 percent.
The preliminary results of the voting have provoked clashes between Ecuador’s opposition and police near the National Electoral Council’s building in the capital, Quito.