He took the view that the President as a “steward of the people” should take whatever action necessary for the public good unless expressly forbidden by law or the Constitution.” I did not usurp power,” he wrote, “but I did greatly broaden the use of executive power.”. He won the Nobel Peace Prize for mediating the Russo-Japanese War, reached a Gentleman’s Agreement on immigration with Japan, and sent the Great White Fleet on a goodwill tour of the world.