Biden commented yesterday in an interview with PBS' Charlie Rose, which touched on the furor over Israel's attack on a flotilla of ships carrying aid and pro-Palestinian activists toward the blockaded territory. Nine people were killed.
Biden told Rose that while Israel's actions dropping troops on the ships can be argued, Jerusalem has a right to know what cargo is headed into Gaza.
A day earlier, White House spokesman Robert Gibbs did not question Israel's motives in trying to enforce its 3-year-old blockade of Gaza. The State Department says Hamas is a foreign terrorist organization.
The United States, unlike most of the world, is not chastising Israel for the raid.
More on the Israeli Raid:
Flotilla Activists Returning to Greece, Turkey
Washington Unplugged: Israeli U.S. Ambassador on Raid