As the War Department administered the Philippines, Taft would remain responsible for the islands, and Elihu Root, the incumbent, was willing to postpone his departure until 1904, allowing Taft time to wrap up his work in Manila. After consulting with his family, Taft agreed, and sailed for the United States in December 1903.[38]

Secretary of War
Roosevelt introduces Taft as his crown prince: Puck magazine cover cartoon, 1906.
When Taft took office as Secretary of War in January 1904, he was not called upon to spend much time administering the army, which the president was content to do himself—Roosevelt wanted Taft as a troubleshooter in difficult situations, as a legal adviser, and to be able to give campaign speeches as he sought election in his own right. Taft strongly defended Roosevelt's record in his addresses, and wrote of the president's successful but strenuous efforts to gain election, "I would not run for president if you guaranteed the office. It is awful to be afraid of one's shadow."[39][40]
Between 1905 and 1907, Taft came to terms with the likelihood he would be the next Republican nominee for president, though he did not plan to actively campaign for it. 