The British government had trusted that the US would continue to share nuclear technology, which it considered to be a joint discovery. On 9 November 1945, Attlee and the Prime Minister of Canada, Mackenzie King, went to Washington, DC, to confer with Truman about future co-operation in nuclear weapons and nuclear power. A Memorandum of Intention was signed on 16 November 1945 that made Canada a full partner and replaced the Quebec Agreement's requirement for "mutual consent" before using nuclear weapons to one for "prior consultation". There was to be "full and effective co-operation in the field of atomic energy", but British hopes were soon disappointed since it was only "in the field of basic scientific research".