With the end of the war the Special Relationship between Britain and the United States "became very much less special". The British government had trusted that America would share nuclear technology, which the British saw as a joint discovery, but the terms of the Quebec Agreement remained secret. Senior members of the United States Congress were horrified when they discovered that it gave the British a veto over the use of nuclear weapons. On 9 November 1945, the new British Prime Minister, Clement Attlee, and the Prime Minister of Canada, William Lyon Mackenzie King, went to Washington, DC, to confer with Truman about future cooperation in nuclear weapons and nuclear power. They signed a Memorandum of Intention that replaced the Quebec Agreement. It made Canada a full partner, and reduced the obligation to obtain consent for the use of nuclear weapons to merely requiring consultation. The three leaders agreed that there would be full and effective cooperation on civil and military applications of atomic energy, but the British were soon disappointed; the Americans made it clear that cooperation was restricted to basic scientific research. The Atomic Energy Act of 1946 (McMahon Act) ended technical cooperation. Its control of "restricted data" prevented the United States' allies from receiving any information.