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Secretary of Defense James Mattis said he won't rule out a possible military strike against Syrian President Bashar Assad's forces following a suspected chemical attack that killed dozens in a town near Damascus.

Saturday's attack unfolded amid a resumed offensive by the Syrian government. The Assad regime has denied responsibility, but many believe it is behind the deadly strike.

On Sunday morning, Trump condemned the attack as "mindless," referred to Assad as an "animal" and said there would be a "big price to pay."

At the Pentagon on Monday, Mattis spoke about how the U.S. will respond to the use of chemical weapons on civilians.

"The first thing we have to look at is why are chemical weapons still being used at all when Russia was the framework guarantor of removing all the chemical weapons. And so working with our allies and partners from NATO to Qatar and elsewhere, we are going to address this issue," Mattis said.

A reporter asked if he could rule out launching airstrikes against Assad.

"I don't rule out anything right now," Mattis responded.

Watch House Armed Services Committee Chairman Mac Thornberry (R-Texas) react above.

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