As they began debate Monday on a $31.9-billion domestic security bill, members of the Senate agreed that last week’s terrorist bombings in London underscored the need to make Americans safer. But they split sharply on how best to spend the limited dollars available. Senators from urban areas, many of them Democrats, pointed to the attacks on London’s mass transit system as evidence that it was time to focus on firefighters, emergency response teams and others who must deal with terrorist episodes — groups that have not always come out on top in the competition for federal funds.Full Story