Congress split over ways to face Islamic State

Congress returns to Washington this week after a 10-day break to confront the difficult business of how the United States should wage war against terrorist organizations such as the Islamic State.
The formal task is to write and approve an “authorization for the use of military force,” or AUMF, but the broader goal is to demonstrate to the world that there is unified, bipartisan support for U.S. military engagement against a new, more mystifying enemy than the ones the United States faced w