At least 58 people were killed in what doctors say could be a nerve gas attack on the Syrian town of Khan Sheikhoun in the rebel-held Idlib province on Tuesday.

Victims showed signs of suffocation, convulsions, foaming at the mouth, and pupil constriction, reported.

Witnesses said the attack was carried out by either Russian or Syrian Sukhoi jets. Both Moscow and Damascus have denied responsibility.

Lt. Col. Ralph Peters (Ret.) says that President Trump must come out with a strong response, or chemical attacks like this could become more and more common.

On "America's Newsroom" today, Peters said it's clear that President Obama's "disastrous" policy in Syria - including his infamous "red line" - has put Trump in a difficult spot.

"But we keep hearing there's a new sheriff in town. Well, the new sheriff has to get serious about rounding up the outlaws," Peters said. "You cannot let this stand."

He noted that even Nazi Germany observed the ban on chemical weapons.

"If we do not respond to this wanton use of nerve gas on men, women and children, believe me, the gates are going to open, you'll see more chemical weapons used, and eventually chemical weapons will be used against our troops," Peters said. "This is a war crime of the first magnitude."

Watch more above, and see Meghan McCain's fiery reaction to the chemical attack.

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