Read the following text from the U.S. Constitution, and then fill in the blank: The president shall be Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States, when called into the actual Service of the United States; he may require the Opinion, in writing, of the principal Officer in each of the executive Departments, upon any Subject relating to the Duties of their respective Offices, and he shall have Power to grant Reprieves and Pardons for Offences against the United States, except in Cases of Impeachment. The U.S. Constitution gives the president of the United States the power to _____. impeach principal officers of executive departments declare war on another nation act as commander of the armed forces sign alliances and peace treaties