Kais Saied says the move, eight months after suspending parliament, aims to preserve the state and its institutions.
Rached Ghannouchi says his party and allies will continue to work against the coup and attacks on the constitution.
Police blocked protesters marching towards the headquarters of the electoral board whose chief Saied recently replaced.
Environment minister says tankers hull is watertight and there is no leakage for the moment.
Last July, President Saied suspended parliament, sacked PM and further expanded his legislative and executive powers.
President Kais Saied denies he is seeking a comeback to individual rule despite accusations he is staging a coup.
Parliamentary speaker Rached Ghannouchi among those questioned over a parliament session held online.
President Kais Saied dissolves parliament in latest move to consolidate power.
Nadia Akacha has been described as President Saieds closest and most trusted adviser.
President Kais Saied appoints temporary top judicial council, a body he dissolved last month amid widespread criticism.