William Edgar Borah (June 29, 1865 - January 19, 1940) was a prominent Republican attorney and longtime United States Senator from Idaho noted for his oratorical skills and isolationist views. One of his nicknames later in life was "The Lion of Idaho." Borah died on January 19, 1940, lamenting the outbreak of World War II. Strong evidence suggests that he fathered Paulina Longworth, the only daughter of Alice Roosevelt Longworth, and thus the granddaughter of Theodore Roosevelt, who was only six years Borah's senior.