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Shineski, a Vietnam veteran himself, pointed out that six of nine studies that were reviewed by his agency showed a substantial link between heart disease and the toxic defoliant and that the research "more than satisfies" the legal requirements.
The agency estimates that the extension of such veterans benefits would cost about $67 billion over the next decade, with each affected former service member receiving about $1,000 per month.
However, some have questioned the connection between Agent Orange and heart disease.
"We have sometimes up here an uncomfortable duty to ask the hard questions," said Virginia Senator Jim Webb, a Vietnam combat veteran. Webb also said that there are too many unknowns regarding the development of heart disease.