Nicusor Dan, the centrist mayor of Bucharest, won almost 54 percent of the vote to beat Simion, leader of the far-right AUR party and an admirer of US President Donald Trump.
But in an about-turn Tuesday, he announced his decision to contest the results.
Neither country “nor anyone else has the right to interfere in the elections of another state,“ he said, calling the election a “farce”.
Online, supporters have posted numerous comments blaming “the system” for “stealing” Simion’s victory.
He added he saw “little chance” the court would grant his request.
Last Friday on a visit to Paris, where he met French far-right European parliament member Marion Marechal, he accused French President Emmanuel Macron of interference.
France's foreign intelligence service rejected the claims.
“I’m ready to come and testify if it helps Romanian democracy,“ Durov wrote on X.
Sunday's ballot came five months after Romania's constitutional court annulled an election over allegations of Russian interference and the massive social media promotion of the far-right frontrunner, who was not allowed to stand again.
For the May vote, Dan, 55, and Simion, 38, campaigned on platforms of change, tapping into voter frustration with a political class widely deemed corrupt.
Romania's president appoints key posts, such as the prime minister, and has significant sway in foreign policy, including representing the country at NATO and EU summits.
The election turmoil has increased economic uncertainty in the EU's most indebted country, which is grappling with high inflation.
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