Complete the following sentence: Protection of the nation's highest elected leaders and other government officials is one of the primary missions of the Secret Service.<unk> Complete the following sentence: <unk> <unk> <unk>
assassination of President William McKinley, Congress also directed the Secret Service to protect the president of the United States.<unk> Secret Service investigates thousands of incidents each year of individuals threatening the president of the United States.<unk> Secret Service investigates thousands of incidents each year of individuals threatening the president of the United States.