Tensions are rising overseas as Israel formally declared war to retaliate against Hamas for Saturday’s surprise attack. The toll has now passed 1,100 dead – incluidng some Americans - and thousands wounded on both sides. Here on Capitol Hill, Senate Leaders and Whips, the chairs of foreign, military and defense committees attended an unclassified briefing following the attacks by Hamas on Israel this weekend. Senate Majority Leader Chuck Schumer says he will try to hold a briefing with all Senators this week. We breakdown the latest response from Washington to this international incident.