Excerpts of the President's News Conference
Now I think that is the real extent at the present time of the Chinese policy, based on those two things—carrying out the Washington Agreements on the one side and doing what we can to get China to protect foreign interests on the other side. Now that includes of course the consideration of the tariff and extraterritoriality and all other questions that were considered in the Washington Agreements.
Source: "The Talkative President: The Off-the-Record Press Conferences of Calvin Coolidge". eds. Howard H. Quint & Robert H. Ferrell. The University Massachusetts Press. 1964.
Calvin Coolidge, Excerpts of the President's News Conference Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/349113