Pakistan's main opposition leader Nawaz Sharif addressed a crowd gathered outside his home in Lahore on Sunday, defying a police order to remain inside under house arrest. "We don't accept this decision. The house arrest is illegal and immoral. All these decisions are unconstitutional," he told the crowd in a speech broadcast live on Pakistan television channels. Sharif, a former prime minister who was last month barred from running for office, has been the main figurehead for a mass anti-government protest scheduled to march from the eastern city of Lahore to Islamabad on Sunday. "Come and join me. I am leaving the house. The time has come to march hand in hand," Sharif said. "They cannot stop the emotions of the people. People have waited for this day for a long time. They cannot stop us," he said. Police earlier put Sharif under a three-day house arrest at his Lahore home. Under the order, he was not allowed to leave the building. An AFP reporter outside his home said a car was preparing to take him to lawyers gathering in the high court building in downtown Lahore.