President Kais Saied shut down the elected parliament in 2021 and began to reshape the political system, but low turnout for December's election of a new, mostly powerless legislature revealed little public appetite for his changes.
Voting runs from 6:00 am (0500 GMT) to 10:00 pm at some 11,000 polling stations across the North African country, while there is no clarity yet on when the results will be announced.
The constitutional referendum, which is expected to pass amid boycott calls, will concentrate all powers in the hands of the president.
Judge orders freeze on financial assets of ex-speaker of the African country's dissolved parliament Rached Ghannouchi, his son, ex-PM Hamadi Jebali, ex-FM Rafik Abdessalem and several other people.
Police in the city of Sousse seized Jebali's phone and his wife's phone and took him to an unknown location, according to a statement by his family.
President Saied is seeking to overhaul the constitution to give the presidency more powers, against the backdrop of a tanking economy and fears of a public finance crisis.
President Kais Saied fires judges, accusing them of corruption and protecting terrorists, as he moves to take control of the North African country's judiciary.
President Kais Saied has denounced attempts by Tunisia's opposition party to form a "national salvation" government overseas, calling the plan a "coup attempt".
Over 2,000 protesters gathered in central Tunis, following President Saied's decree establishing a new judicial watchdog that lets him dismiss judges or block their promotion.
Friday's protest was against a ban on all indoor or outdoor gatherings the government of President Kais Saied announced this week to stop a Covid-19 wave.
One member of the Ennahda party has died and several others have been injured after a fire erupted at the party's headquarters.
The future of Ennahda will depend not on its ideology, but its organisational transformation, political choices, and the political system’s new arrangements.
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