Two U.S. Defense officials have confirmed what we’ve feared for months: ISIS is using chemical weapons, and they’re targeting American-supported fighters. We now know that Kurdish peshmerga forces—some of the most able American-supported fighters against ISIS—have been hit and at the very least, dozens of fighters have suffered wounds from chemical weapons.

ISIS has remained resistant to this Administration’s halfhearted attempts to degrade and destroy it. In the time ISIS has had to solidify its position, the terrorist organization has developed chemical weapons, including Sulfur mustard, a blister agent, and mustard gas.

This proliferation and increased use of chemical weapons is dangerous and violates all standards of humanity. The longer we allow ISIS to exist, the more ISIS can develop these weapons and use them against our allies or potentially even American troops in the region.