At the time, Prince Naruhiko Higashikuni was said to be the only person who could control the Army and the Navy and was recommended by Konoe and Tojo as Konoe's replacement.
Hirohito rejected this option, arguing that a member of the imperial family should not have to eventually carry the responsibility for a war against the West as a defeat would ruin the prestige of the House of Yamato.
Following the advice of Kōichi Kido, he chose instead Tojo, who was known for his devotion to the imperial institution.
By tradition, the Emperor needed a consensus among the elder statesmen or "jushin" before appointing a prime minister, and as long as former Prime Minister Admiral Keisuke Okada  was opposed to Tojo, it would be impolitic for the Emperor to appoint him.
During the meetings of the jushin regarding Prince Konoe's succession, Okada argued against Tojo's appointment while the powerful Lord Privy Seal Kōichi Kido pushed for Tojo.
The result was a compromise where Tojo would become Prime Minister while "re-examining" the options for dealing with the crisis with the United States, though no promise was made Tojo would attempt to avoid a war.

After being informed of Tojo's appointment, Prince Takamatsu wrote in his diary: "We have finally committed to war and now must do all we can to launch it powerfully.
But we have clumsily telegraphed our intentions.
We needn't have signaled what we're going to do; having [the entire Konoe cabinet] resign was too much.
As matters stand now we can merely keep silent and without the least effort war will begin."
Tojo's first speech on the radio made a call for "world peace", but also stated his determination to settle the "China Affair" on Japanese terms and to achieve the "Greater East Asia Co-Prosperity Sphere" that would unite all of the Asian nations together.
At the time, Prince Naruhiko Higashikuni was said to be the only person who could control the Army and the Navy and was recommended by Konoe and Tojo as Konoe's replacement. Hirohito rejected this option, arguing that a member of the imperial family should not have to eventually carry the responsibility for a war against the West as a defeat would ruin the prestige of the House of Yamato. Following the advice of Kōichi Kido, he chose instead Tojo, who was known for his devotion to the imperial institution. By tradition, the Emperor needed a consensus among the elder statesmen or "jushin" before appointing a prime minister, and as long as former Prime Minister Admiral Keisuke Okada  was opposed to Tojo, it would be impolitic for the Emperor to appoint him. During the meetings of the jushin regarding Prince Konoe's succession, Okada argued against Tojo's appointment while the powerful Lord Privy Seal Kōichi Kido pushed for Tojo. The result was a compromise where Tojo would become Prime Minister while "re-examining" the options for dealing with the crisis with the United States, though no promise was made Tojo would attempt to avoid a war. 
After being informed of Tojo's appointment, Prince Takamatsu wrote in his diary: "We have finally committed to war and now must do all we can to launch it powerfully. But we have clumsily telegraphed our intentions. We needn't have signaled what we're going to do; having [the entire Konoe cabinet] resign was too much. As matters stand now we can merely keep silent and without the least effort war will begin." Tojo's first speech on the radio made a call for "world peace", but also stated his determination to settle the "China Affair" on Japanese terms and to achieve the "Greater East Asia Co-Prosperity Sphere" that would unite all of the Asian nations together.
Hideki Tojo