"The wrong political choices of the leadership of the Ennahda movement led to its isolation and failure," 113 senior officials from the party said in a joint statement.
How the government will handle this crisis will shape the trajectory of the rest of its tenure.
Amid a sharp spike in attacks and desecrations of mosques in Tunisia, some see a larger strategy at work trying to incite religious conflict and undermine the current government.
Saied, a conservative, won the presidential election earlier this month. He succeeds the late Beji Caid Essebsi, who died in office in July.
Independent outsider and law professor wins landslide victory in presidential runoff, sweeping aside his rival, media magnate Nabil Karoui, exit poll shows.
Tunisians are going to choose the president among a populist tycoon who just got out of jail against a conservative professor in a runoff vote on Sunday.
Ennahda came first in Sunday's parliamentary election, winning 52 seats, while media mogul Nabil Karoui's Heart of Tunisia party won 38 seats in the 217-seat chamber, the electoral commission said.
While preliminary official results are not expected until Wednesday, Ennahdha and Qalb Tounes (Heart of Tunisia) — who have ruled out forming an alliance— were both swift to claim victory.
The vote comes two weeks after the first round of a presidential election that swept aside traditional political parties in favour of independent candidates, a trend likely to be repeated in the ballot for MPs.
During his era, Ben Ali's photograph was displayed in every shop, school and government office from the beach resorts of the Mediterranean coast to the impoverished villages and mining towns of Tunisia's hilly interior.
Neither candidate has ever held political office but they beat out two prime ministers and the candidate for the moderate religious party Ennahdha.
Nothing is certain in Tunisia's presidential election, only the second since the 'Arab Spring'.
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