The Gathering Storm (2002) on Netflix

In the 1930s, Winston Churchill was out of government, sitting as a backbench MP. His was a lonely voice warning about German rearmament and the coming of a second major war on the Continent. He lost a great deal of money in the Wall Street crash and now writes - a biography of his ancestor the Duke of Marlborough, a newspaper column - and it's his only means of support. He has a close-knit group of supporter not the least of whom is his wife Clemmie, who he loves very dearly. As he continues to press his concerns about Hitler, he is cast as a warmonger and frequently shouted down in Parliament by members on both sides of the aisle. With reliable information from a Foreign Office civil servant who feels the government is not accurately reporting on rearmament, he provides accurate figures to Parliament and the tide begins to turn. With the onset of World War II in September 1939, Churchill returns to government as First Lord of Admiralty.