Mauritanians are voting for the first time since the country gained independence from France in 1960.
The 62-year-old is standing down after serving the maximum two five-year elected terms.
However the status quo is likely to prevail when a new leader is elected.
Abdel Aziz has expressed his support for Mohamed Ould Ghazouani, who is a former general and defense minister.
Trump leaves Beijing with few wins, many warm words for Xi
US President Donald Trump departed China on Friday touting business deals that gave markets little to cheer, while Beijing warned Washington about mishandling Taiwan and said its war with Iran should never have started.
Trump says he won't be much more patient with Iran
US President Donald Trump has said he would not be much more patient with Iran as he urged Tehran to reach a deal with Washington while also suggesting that the quest to retrieve Iran's enriched uranium was more about perception than about security.
India raises retail fuel prices first time since Iran war started
India's state-run fuel retailers have raised petrol and diesel prices for the first time in four years by 3 rupees ($0.03) per litre, or more than 3 per cent, according to dealers, to recoup some of the losses incurred due to higher global crude oil prices.
Ukrainian drone attack kills three in Russia's Ryazan
A Ukrainian drone attack has killed three people in the central Russian city of Ryazan, damaged high-rise apartment buildings and hit an industrial enterprise, Regional Governor Pavel Malkov said early on Friday.
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