Opposition parties in Pakistan on Monday called on the Supreme Court to remove Prime Minister Nawaz Sharif from office after an investigation found that he and his family possess wealth exceeding their known sources of income.

The investigation is linked to the mass leak of documents from a Panama-based law firm in 2016, which revealed that Sharif and his family have offshore accounts.

Naeem Bukhari, a lawyer for opposition leader Imran Khan, submitted the request to the court. The court has the constitutional power to disqualify someone from serving as prime minister, and is expected to rule in the coming weeks.

The Sharifs have denied any wrongdoing. Their attorney, Khawaja Haris, argued Monday that the probe was flawed. The court will resume hearing the case Tuesday.