ISLAMABAD (Online) - Chief of Pakistan Tehreek-e-Insaf (PTI) Imran Khan on Sunday said that he would contest polls in upcoming elections against PML-N President Mian Nawaz Sharif.    Talking to a private TV channel, he said that both the PML-N and the ruling party PPP have destroyed the country’s institutions.The corrupt leadership of both parties PPP and PML-N looted the public wealth and transferred it to the foreign banks, he said, adding, they do not want to have their accountability. Both the corrupt parties have disappointed the nation and they are looking for a change, he said. Criticising the PML-N, he said it is not a reliable party as Nawaz Sharif deceived the nation three times in the past. Those who described Zardari as a corrupt person, remained in alliance with him for three years, he added. He said that PML-N is playing the same role as Maulana Fazlur Rehman played during Musharraf’s period. Talking about the upcoming elections, he maintained that he would not form alliance with any party which has representation in the present Parliament.  However, he said if PTI could not attain simple majority in the elections, it would sit on the Opposition benches. Imran Khan said that PTI would stage a protest demo in Peshawar on July 14th against restoration of NATO supplies.