SLAMABAD — Pakistan's top court ordered the arrest of the prime minister in a corruption case Tuesday, the latest clash between the government and a judiciary that has repeatedly pressured the country's political leaders.

The ruling is sure to inflame the already antagonistic relationship between the court and the government, pushing the country toward yet another political crisis. It also could provide ammunition to Tahir-ul-Qadri, a firebrand Muslim cleric who was leading tens of thousands of people in a second day of rallies in Islamabad to press for the removal of the government, which he criticized as corrupt and indifferent to the common man.

The Supreme Court order against Prime Minister Raja Pervaiz Ashraf was related to a case involving private power stations set up to provide electricity to energy-starved Pakistan. The judges are investigating allegations that the bidding process was marred by corruption.