Imran Khan, a former prime minister of Pakistan, will be called before a court the following week in a contempt case.

Imran Khan, the former prime minister, was ordered by an Islamabad court on Tuesday to come before the tribunal the next week to address contempt charges stemming from his verbal threats against a judge during a rally over the weekend.

The change suggested that Mr. Khan, who has been holding large demonstrations to regain power, is under increased pressure from the Pakistani government. Separately, police searched Shahbaz Gill’s apartment in the Pakistani capital throughout the night and handcuffed him before taking him away for questioning.

Mr. Khan would be permanently barred from politics if found guilty; under Pakistani law, no one convicted of a crime is permitted to run for office. Mr. Khan is scheduled to appear before the Islamabad High Court on August 31.

Mr. Khan, a former cricket player, turned Islamist politician, is accused of contempt for the second time. After the 1993 elections, the Supreme Court summoned him but then released him, claiming the judiciary’s actions were “shameful” and did not secure free and fair elections.

Senior Tehreek-e-Insaf official Fawad Chaudhry told The Associated Press that while Mr. Khan’s team would review the summons, they believed the Islamabad High Court lacked the authority to charge Mr. Khan for contempt of court.

Legal experts believe Mr. Khan has few options but could avoid prosecution if he apologizes for his Saturday comments about Judge Zeba Chaudhry, in which he threatened her with legal action.