In response to fraud claims, electoral authorities insisted no incidents were reported during the counting process and said if necessary, they will recount votes at polling centers where results are formally challenged.
Ahead of Lasso's announcement of the specific details of his challenge to the results Wednesday, head of the National Electoral Council, Juan Pablo Pozo, noted that only 835 electoral rolls - or 2 percent of the more than 40,000 rolls - presented irregularities and would be submitted to a public audit. He also called his supporters to fill the streets to guard against fraud.
The scene was much calmer than the one on election night, when thousands of outraged Lasso supporters shouting "fraud" crashed through metal barricades to nearly reach the entrance of the electoral council's headquarters in Quito.
"We are going to demand. that the votes be recounted one by one, in the entire country", Lasso told reporters at a press conference.
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"We predict that they will deny our request, but in the denial of our requests is confirmation of the fraud", he said.
Lasso, who has largely relied on the disparity between favorable exit polls and the official election results as the basis for his fraud accusations, presented paltry evidence for his case Wednesday challenging 1,795 of the country's 41,042 electoral rolls.
"By force they want to achieve what they can't at the ballot box", he said. Before a crowd of hundreds of supporters, the apparent President-elect sang "happy birthday" to Correa, who turns 54 later this week. "The United States congratulates the people of Ecuador on taking part in the second-round Presidential elections on April 2".
Outside the region, the election was being closely watched by supporters of WikiLeaks founder Julian Assange, who has been living under asylum at Ecuador's embassy in London since 2012. Moreno said he would let him stay. As it became clear that Mr Moreno would win, Mr Assange tweeted: "I cordially invite Lasso to leave Ecuador within 30 days (with or without his tax haven millions)", in reference to...