Although Canada achieved full status as a sovereign nation in the Statute of Westminster 1931, there was no consensus about how to amend the constitution; attempts such as the 1965 Fulton–Favreau formula and the 1971 Victoria Charter failed to receive unanimous approval from both levels of government. When negotiations with the provinces again stalled in 1982, Trudeau threatened to take the case for patriation to the British parliament " bothering to ask one premier". According to the federal cabinet and Crown counsel, if the British Crown (in council, parliament and on the bench) exercised sovereignty over Canada, it would do so only at the request of the federal ministers.