The contentious new constitution is up for a referendum among Tunisians, according to BBC.
The vote, according to President Kais Saied, is required to progress political changes.
But according to his detractors, it will solidify the authority he took when he began what has essentially been one-man rule a year ago.
The Arab Spring, which brought the fall of longtime dictator Zine al-Abidine Ben Ali in 2011, began in Tunisia.
President Saied selected that day for the referendum to commemorate exactly one year since his momentous decision to dissolve the administration and suspend the legislature.
He has effectively ruled by edict ever since.
The new constitution would grant the head of state complete executive control, ultimate command of the army, and the power to appoint a government without parliamentary approval. It would replace the one that was drafted in 2014, three years after the Arab Spring.
According to Mr. Saied, it is necessary to end a cycle of political inaction and economic decline.
According to him, his reforms will secure a better future and are being carried out in the spirit of the 2011 revolution.
“Our money and our wealth are enormous, and our will is even greater, to rebuild a new Tunisia and a new republic, one that breaks with the past,” the president said after voting on Monday morning.
His many detractors claim that it might bring Tunisia back to an actual dictatorship.
The major parties are abstaining from the election, including the Islamist Ennahda.
There appears to be little enthusiasm for the vote, despite the fact that President Saied still maintains a core of supporters among Tunisians who think the nation needs a strong leader to address its issues.
A minimal turnout is anticipated. However, because there is no requirement for a minimum level of participation, it is likely to pass.
Although voting ends at 22:00 local time (21:00 GMT), it’s unclear when the results will be made public.