“Despite the public’s overwhelming concern about this war, your administration has provided shifting, and at times conflicting, objectives for this war, refused to define the scope of U.S. operations or the measurements for success, and failed to articulate an end game,” wrote Senators Chuck Schumer of New York, the minority leader; Jack Reed of Rhode Island, the top Democrat on the Armed Services Committee and Jeanne Shaheen of New Hampshire, the ranking member of the Foreign Relations Committee.