The party of Pakistan’s jailed former leader Imran Khan on Saturday launched a protest campaign against the outcome of the country’s recent presidential election, claiming that the vote was rigged. Thousands of Pakistan Tehreek-e-Insaf (PTI) supporters rallied in more than a dozen cities, including the capital, Islamabad. “Our leaders and workers are being arrested in various cities,” PTI leader Ali Muhammad Khan told local media. Local administrations in several cities have deployed riot police and imposed bans on rallies and gatherings. The protesters voiced their concerns over what they cla…