The investigators say that she produced a forged trust deed about the London apartments. The 2006 document claims that she was only a trustee and not owner of two offshore companies that bought the apartments. But investigators say it was typed in Calibri font, which was not commercially available to the public until 2007.

The investigators also allege that a letter sent by a Qatari royal whose family had been a business partner of Mr. Sharif’s father is fake. The letter supposedly provided details of their financial dealings.

On Monday, when the Supreme Court convenes, it could order the opening of a criminal investigation against the prime minister and his children after they are given a chance to respond to the investigation. But Mr. Khan is hoping that the justices, after having gone through the investigative report, will immediately remove Mr. Sharif under Article 62 and 63 of the Constitution, which calls for the disqualification of any lawmaker found to be dishonest.

Government officials, on the other hand, say that they expect a prolonged bitter legal battle.

“There is no precedent of the court using Article 62 and 63,” Zafarullah Khan, the minister of state for law and justice and a top aide to the prime minister, said in an interview. “If a new history is to be made, I cannot say, but there is not a single precedent.”

He also said Mr. Sharif’s legal team planned to challenge the findings of the investigation team. “We have confidence in the Supreme Court,” said Mr. Khan, who is not related to Imran Khan. “The so-called evidences gathered by the investigative team are based on ‘sourced reports’ and don’t have evidentiary value.”

He added: “It is a political case. The opposition parties are using the shoulder of the courts to have a judicial coup.”

The minister said that the ruling party, Pakistan Muslim League-Nawaz, or PML-N, was standing firmly behind the prime minister. “There is a political upheaval, but it has been so for the last four years,” he said. “The opposition has been demanding resignation from Day 1. So what?”