Syrian state media first blamed the United States for the attack. But the Pentagon said it wasn't the US.

Israel's foreign ministry had no comment.

Today's strike came after another chemical weapons attack Saturday against Syrian civilians, and after President Trump had tweeted, "Many dead, including women and children, in mindless CHEMICAL attack in Syria ... President Putin, Russia and Iran are responsible for backing Animal Assad. Big price..."

Video showed men, women and children in a Syrian hospital, victims of the gas attack, gasping for air.

That chemical attack came just after dusk on Saturday near the capital of Damascus. More than 40 people have died.

The regime of Syrian dictator Bashar al-Assad, backed by the Russians, denies using chemical weapons and claims video of victims was fabricated.

While the US said it did not attack the Syrian airbase today, the White House is not ruling out a future military response.

White House Homeland Security and Counterterrorism Advisor Thomas Bossert said, "I wouldn't take anything off the table. These are horrible photos from the alleged attack. We're looking into the attack at this point." (Screengrab: Victims of the latest chemical weapon attack in Syria/ via CBN News)

And Republican Sen. Lindsey Graham on ABC urged President Trump to take strong action, calling on him to show a resolve some say President Obama never did, in order to get the situation in Syria right.

"Well it's the defining moment in his presidency because he has challenged (Syrian President Bashar) Assad in the past not to use chemical weapons. We had a one-and-done missile attack. So Assad is at it again. They see our resolve breaking, they see our determination to stay in Syria waning and it's no accident they used chemical weapons. But President Trump can reset the table, here. To me, I would destroy Assad's air force, I would create safe zones in Syria," Graham said.

Trump will meet with his senior military leadership today, which is also the first day on the job for new national security adviser, John Bolton, who in the past has advocated strong military action against Syria.

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