In an interview with the Mediapart investigative news site, Franco-Lebanese businessman Ziad Takieddine said he had made three trips from Tripoli to Paris in late 2006 and early 2007 with cash for Sarkozy's campaign.
Each time he carried a briefcase containing between 1.5 and 2.0 million euros in 200-euro and 500-euro notes, Takieddine said in a video interview, adding that he was given the money by Gaddafi's military intelligence chief Abdallah Senussi.
During questioning in a separate case, Takieddine accused Sarkozy of having been in Gaddafi's pocket in 2006-07 but he had never previously claimed to be the bagman.
The allegations against Sarkozy first emerged in March 2011, when the French leader was campaigning for the NATO-led military intervention that helped overthrow Gaddafi.
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"Sarkozy must first give back the money he took from Libya to finance his electoral campaign," Kadhafi's son Seif al-Islam, who is now in jail in Libya, demanded.
Sarkozy, who lost his 2012 re-election bid, vigorously denied the allegations, claiming the document was a fake.
Takieddine's video testimony comes five days before Sarkozy goes up against former prime minister Alain Juppe and other rivals in a primary to choose the candidate of the French right in next year's presidential vote.
The first round of the two-stage primary takes place on Sunday.
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