Pakistan Muslim League-Nawaz (PML-N) leader Maryam Nawaz on Friday lashed out at opponents hours after a Supreme Court ruling banned her father and former prime minister Nawaz Sharif from holding public office for life.

"Who are they fooling? (The) duration of disqualification is not for life," said Maryam at a social media convention of the party in Sialkot.

"Opponents wasted 30 years trying to stop Nawaz Sharif . They couldn't."

The ruling was the latest in a series of blows to Nawaz who was ousted from the premiership over graft allegations last July.

Supreme Court Justice Umar Ata Bandial described the ban on Sharif as "permanent" in a judgement read to the court, clarifying the length of an earlier ruling that disqualified the former premier from office.

The decision was immediately panned by Nawaz Sharif 's ruling Pakistan Muslim League-Nawaz party (PML-N).

"Today once again, the three-time elected prime minister of Pakistan has been disqualified for life," state minister and Sharif ally Marriyum Aurangzeb told reporters outside the court.

Last month, Nawaz's brother Shahbaz Sharif formally took charge of the PML-N after an earlier court ruling banned the former premier from heading the party.

Nawaz Sharif was the 15th prime minister in Pakistan's 70-year history - roughly half of it under military rule - to be removed before completing a full term.

Despite the numerous court rulings against the PML-N, the party has won a string of recent by-elections proving it will likely remain a force in the next polls.