Jamiat Ulema-e-Islam"s head has campaigned for regressive legislation targeting women, and opposed legislation to eliminate violence against women Fazlur Rehman has also refused to allow women members of his party to participate in the demonstration ISLAMABAD: Tens of thousands of Jamiat Ulema-e-Islam supporters remained in a protest camp in the heart of Pakistan"s capital on Saturday amid tight security, as authorities deployed additional shipping containers and riot police to block access to key government buildings. The protest caravan rolled into Islamabad on Thursday led by firebrand cleric Maulana Fazlur Rehman, who heads the Jamiat Ulema-e-Islam party. He"s given Prime Minister Imran Khan until Sunday night to resign over the country"s economic hardships. Khan says he won"t succumb to pressure. Rehman has hinted he may try to force Khan to step down by staging a mass march on the "Red Zone," where Parliament, the prime minister"s residence, government offices and foreign embassies are located. Authorities in Islamabad were seen early Saturday moving more rows of massive shipping containers onto roads leading to the Red Zone. Paramilitary forces were also deployed. "This mammoth crowd has the capacity to arrest the prime minister themselves from the prime minister"s house if he has not resigned within two days," Rehman said Friday night, while asking Pakistan"s powerful military not to side with Khan. Rehman had initially denied female journalists access to his all-male encampment, which stretches over a kilometer (mile) along a highway and into an open area allocated by the government. His ban caused a storm on social media, and women reporters were eventually allowed into the camp. The hard-line cleric has campaigned for regressive legislation targeting women, and opposed legislation to eliminate violence against women. He has also refused to allow women members of his party to participate in the demonstration. Rehman has been accusing the military of influencing the 2018 parliamentary elections that saw Khan"s Pakistan"s Tehreek-e-Insaf party come into power. Rehman"s seven-party political alliance, Muttahida Majlis-e-Amal, could secure only 16 seats in the 342-member National Assembly, the lower house of parliament. Khan received 155. Rehman, without naming the army, said Friday that: "If it is felt that state institutions were behind the rigged elections and protecting these incompetent and illegitimate rulers, we won"t be able to stop ourselves from forming an opinion about these institutions." Khan made clear he would not resign or hold early elections, after discussing the situation with Cabinet members and party leaders on Saturday, said Defense Minister Pervez Khattak. The minister, who heads the government committee that"s negotiating with Rehman"s protesters, said they can continue to assemble as long as they want. But he warned them not to violate a deal signed before the protest caravan set off for the capital, in which the demonstrators agreed to stay in the designated area while the government promised not to hinder their protests. Khan had told a gathering Friday in the northern city of Gilgit that he "will continue to hold the corrupt accountable," and that he"s not afraid of Rehman"s threats to his government. The mass rally comes after Pakistani businesses observed a nationwide strike earlier this week against recently enacted taxes, which the opposition says were imposed as part of the International Monetary Fund"s $6 billion bailout package for Pakistan. Also Friday, military spokesman Maj. Gen Asif Ghafoor told a local television station that "Chaos is not in the interest of the country ... all democratic issues should be dealt with in a democratic manner." He said the opposition should understand that the army is impartial and supports the democratically elected government, not political parties.