 Tupper thought that the British should restrict American access to these fisheries so that they could negotiate from a position of strength.When Prime Minister Macdonald travelled to represent Canada's interests at the negotiations leading up to the Treaty of Washington (1871), Tupper served as Macdonald's liaison with the federal cabinet.On January 19, 1872, Tupper's service as Privy Council president ended and he became Minister of Inland Revenue.