Andrés dismissed Israel's explanation in his interview, telling ABC News: "Every time something happens, we cannot just be bringing Hamas into the equation."
Andrés' interview came on the six-month anniversary of Hamas' deadly Oct. 7 attack on Israel, which launched the war in Gaza.
The United States is pressuring Israeli Prime Minister Benjamin Netanyahu and his government over the rising number of civilian deaths in Gaza. Some officials have suggested cutting off aid to Israel in an effort to forge a cease-fire.
"They were providing food to hungry civilians in the middle of a war," Biden said. "They were brave and selfless. Their deaths are a tragedy."