US Ambassador to Pakistan Cameron Munter has said that Pak-Iran gas pipeline was not a 'good idea and Islamabad should import gas from Turkmenistan. He was speaking at a private university here on Friday. Munter said that it was Pakistans responsibility to investigate the memo and Hussain Haqqani issue. He reiterated that he had never held joint meeting with ISI chief General Pasha and PTI Chairman Imran Khan. The US envoy said that the US wanted good military and civil relations with Pakistan.