According to _The Gathering Storm_, the first volume of Sir Winston Churchill's _The Second World War_, Lord Halifax told both Churchill and Chamberlain that his position as a peer outside the House of Commons would make it difficult for him to discharge the duties of Prime Minister. Ultimately a National Government including representatives of the Labor and Liberal parties was formed, but, according to Churchill, the King made no stipulation "about the Government being National in character." Lord Halifax certainly doubted his ability to discharge his duties as Prime Minister. But apparently the question of whether he could form a National Government did not arise. In any event, the King, fully cognizant of the views of a considerable section of the Conservative Party on the relative merits of the two men and aware that it would have been possible to form a Conservative government under Halifax, sent for Churchill instead of Halifax and asked him to form a government. History may record this as a signal example of the remaining powers of the Crown. Sir William Anson explained in _The Law and Custom in the Constitution_ that the real power of the sovereign "is not to be estimated by his legal or his actual powers as the executive of the State. "The King or Queen for the time being is not a mere piece of mechanism, but a human being carefully trained under circumstances which afford exceptional chances of learning the business of politics." The monarch is not isolated from great affairs. The Queen sees from the inside the workings of government, knows the individuals concerned, and often has a surer sense of what the people will or will not accept than some politicians. So, Sir William reasoned, the sovereign in the course of a long reign may through experience become a person whose political opinions, even if not enforceable, will carry weight. Continuity in office, wide experience in contact with successive governments, and, finally, the influence that the monarchy exercises through an ancient and well-established tie with the people can confer upon the sovereign an influence far greater than is generally realized. Queen Elizabeth II has twice used the royal prerogative of choosing a Prime Minister. On April 6, 1955, she chose Sir Anthony Eden to succeed Sir Winston Churchill. On January 10, 1957, she chose Harold Macmillan to succeed Sir Anthony. The second selection occasioned sharp political outcry. The "shadow cabinet" or Parliamentary Committee of the Labor Party, meeting in secrecy and dudgeon, reported that the Queen's choice had raised serious questions of a constitutional nature. It argued that the Conservative Party, by asking the sovereign to choose between Mr. Macmillan and R.A. Butler, had involved the Queen in partisan politics. The Tories, Labor said with a touch of self-righteousness, should always have a leader and a deputy leader of the party ready to assume the highest office when called.