Port-au-Prince, Haiti (CNN) -- Secretary of State Hillary Clinton presented a united stance with Haitian President Rene Preval during her visit Saturday to the quake-battered capital. Clinton, the highest-ranking U.S. official to visit the country since Tuesday's 7.0-magnitude quake, sought to assure the Haitian people that the United States is working with the government "to assist in every way we can." "We are here at the invitation of your government to help you," she said. "As President Obama has said, we will be here today, tomorrow and for the time ahead." Clinton said she and Preval will issue a joint communique Sunday "setting forth our intention to cooperate together."
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NEW: Clinton says global aid can help Haiti become better place than it was before quake
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NEW: Medical official warns that a third of patients in makeshift hospital may die without surgery
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NEW: Amid chaos, signs of progress, including aid distribution sites, hospitals
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Ex-Presidents Clinton and George W. Bush to lead fundraising effort for Haiti
Elsewhere, a food drop by U.S. helicopters in @placeholder became a chaotic scene as hundreds of Haitians without food and water for four days rushed the boxes of aid being shoved out of the open doors.