Co-Chairman of PPP, Asif Ali Zardari Sunday has said that government's top priority is to improve security situation in tribal areas, adding US support is required in this regard. In an interview to US radio, Asif Zardari said Pakistan needed full support of US to strengthen democracy, economy and security situation in the country. About corruption charges, he said that all cases were politically motivated which were rejected by the people of Pakistan. Zardari said that the decision to bring PPP man in presidency was aimed at strengthening country's democracy.