Secretary of State John Kerry said Sunday that the United States now has proof that lethal sarin gas was used in Syria on civilians, in building the administration’s case of a military strike on the Middle East country.

Kerry told “Fox News Sunday” that blood and hair samples taken from first-responders in Damascus have tested positive for sarin.

“This case is going to build,” said Kerry, who also defended President Obama’s decision to seek congressional approval for a military strike.

“Our country is much stronger when we act together,” Kerry said. “I think this is a smart decision by the president, a courageous decision.”

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