London- Muttahida Qaumi Movement chief Altaf Hussain has asked Prime Minister Nawaz Sharif to invite Imran Khan and Tahirul Qadri to the negotiating table and resolve the ongoing political crisis. He said today that every problem could not be solved through baton-charge and tear gas shelling. Hussain urged Sharif to visit Imran and Qadri on their containers. The MQM chief also called on the government to refrain from using force against protesters. He said that delay in resolving the crisis was harmful for the country.