Elizabeth met the President again two years later, at the official opening of the Saint Lawrence Seaway. As she made her way through a full tour of Canada, at the end of which she chaired a meeting in Halifax of her Canadian Privy Council and personally appointed Georges Vanier as her representative in Canada, the Queen crossed the border twice to pay a visit to the United States, stopping in Chicago and Washington. Again, Diefenbaker was her chief minister in attendance; the Prime Minister was insistent that it be made clear to Americans that Elizabeth was visiting them as the Canadian monarch and that it was "the Canadian embassy and not the British Embassy officials who are in charge" of the Queen's itinerary. In this vein, the Queen's speeches in Chicago, written by her Canadian ministers, stressed steadily the fact that she had come to call as Queen of Canada, and she hosted the return dinner for Eisenhower at the Canadian Embassy in Washington. Her Majesty also did her part to assist in entrenching the newly emerging Canadian character, ensuring that the Red Ensign (then Canada's national flag) be flown on the Royal Yacht, and she stood to attention for the duration of each playing of "O Canada", the country's then still unofficial national anthem, sometimes even joining in the singing.