Answer is "President of the United States of America"
The national Christmas tree is actually a large tree which an evergreen tree and located Near the famous white house and northeast quadrant of " The ellipse".
Since the year 1923, this tree is decorated every year as the Christmas tree and when the December came it is lit by the president of America. Since the President Franklin D.Roosevelt Every year some formal remarks are made by the President himself during the lighting ceremony of this tree.
