Police are investigating alleged irregularities over the financing of his 2007 presidential campaign.
Nicolas Sarkozy’s former aide, Alexandre Djouhri, was also arrested in London recently.
The former president failed in a bid to return to power in 2012.
According to judicial sources, Nicolas Sarkozy was being questioned in Nanterre, a suburb in western Paris.
In 2013, France opened an investigation into allegations that Nicolas Sarkozy’s campaign had benefited from illicit funds from Muammar Gaddafi. Nicolas Sarkozy has denied wrongdoing.
The sources said one of Nicolas Sarkozy’s former ministers and a close ally, Brice Hortefeux, was also being questioned by police on March 20.
The allegations came from a French-Lebanese businessman, Ziad Takieddine, and some former Gaddafi regime officials.
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