0611 GMT October 28, 2021
The protesters gathered in the centre of the capital chanting "Shut down the coup" and "We want a return to legitimacy", while a few dozen Saied supporters held a counter demonstration chanting "The people want to dissolve parliament", Reuters reported.
The protest, accompanied by a heavy police presence, was the first since Saied declared on July 25 he was sacking the prime minister, suspending parliament and assuming executive authority.
Saied's moves were broadly popular in a country chafing from years of economic stagnation and political paralysis, but they have raised fears for the new rights and the democratic system won in the 2011 revolution that sparked the uprisings in the Arab countries.
Though the biggest party in parliament, Ennahda, initially decried his move as a coup, it quickly backed down and the period since Saied's intervention has been calm.
However eight weeks on, Saied is still to appoint a prime minister or declare his longer-term intentions.