The joint opposition on Saturday announced its decision to move a no-confidence motion against the National Assembly speaker.
Addressing a news conference at the Sindh House after Prime Minister Imran Khan managed to secure the vote of confidence from the parliament, leaders of the Pakistan Democratic Movement, an alliance of 11 opposition parties, attributed the premier's success to arm twisting lawmakers.
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"The prime minister has no moral courage," PPP Chairman Bilawal Bhutto Zardari said.
"This confidence vote lacks constitutional legitimacy," he added.
"The government's days are numbered and it will not carry on through intimidation."
Speaking on the occasion, PML-N Vice President Maryam Nawaz condemned the attack on her party's Ahsan Iqbal and Marriyum Aurangzeb at Islamabad's D-Chowk.
"We describe this as state-sponsored fascism," she added.
"Changing decisions through intimidation won't serve any purpose.
Bilawal said for three years a "selected government" was running the country and the PDM would have to decide whether the NA speaker should continue holding the post or not.
"The joint opposition proved its numerical supremacy in parliament by bagging the seat of Yousuf Raza Gilani in the recent Senate elections.
In response, the PTI unleashed its goons on PML-N leaders. Asif Zardari, Maulana Fazlur Rehman and Nawaz Sharif don't resort to such tactics," he added.
Former premier Raja Pervez Ashraf of the PPP said PM Imran had to beg for votes from the MPs he had described as "for sale material".
"Today's a dark day for democracy. The opposition lawmakers made the correct decision of boycotting the session," he added.
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