Announcement to the Vice-President of the Death of President McKinley and the Reply of the Vice-President
At the residence of Mr. Ansley Wilcox, 641 Delaware Avenue, Buffalo, N.Y., Mr. Root stepped forward and said, with deep emotion: "Mr. Vice-President, I have been requested on behalf of the Cabinet of the late president--at least those who are present in Buffalo, all except two--to request that for reasons of weight affecting the affairs of Government you should proceed to take the constitutional oath of President of the United States."
THE VICE-PRESIDENT'S REPLY.
"I shall take the oath at once in accordance with your request, and in this hour of deep and terrible national bereavement I wish to state that it shall be my aim to continue absolutely unbroken the policy of President McKinley for the peace and prosperity and honor of our beloved country."
Theodore Roosevelt, Announcement to the Vice-President of the Death of President McKinley and the Reply of the Vice-President Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/206237