ISLAMABAD (Reuters) - The United States will not abandon its drone programme in Pakistan but how it goes forward is a matter for US and Pakistani intelligence and military officials to determine, a US official said on Wednesday. The programme is something that we have said we go ahead on. The question is how. And that process is going to be something thats going to be one of the main tasks that our intel and our military guys have, the official said, speaking to reporters on condition of anonymity. The comments came as Admiral Mike Mullen, chairman of the US militarys Joint Chiefs of Staff, visited Pakistan in the highest level trip by a US official since ties were badly strained over the case of CIA contractor Raymond Davis, who shot dead two Pakistanis in Lahore on Jan. 27. Ill pause from my normal optimism and say this is a tough one. This is a real tough one, the official said. Because that has been so inflamed in the public that the ability of our intelligence and our military guys to get together and say 'whats our common ground here? is limited. US officials have privately said in the past that Washington would not consider demands by some Pakistani officials for sharp cuts in drone attacks or suggestions the United States should return to a Bush-era policy limiting the strikes to high-value militant targets.