"Sean Spicer said today that Adolf Hitler “didn’t even sink to using chemical weapons” — a comment at odds with Hitler’s use of gas chambers to exterminate Jews during the Holocaust."
Shaky
Not to diminish the reference to the Holocaust, but I think that Spicer was referring to combat use, as in WW1.
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That said, I think a much better reply from Spicer might have been
"With our all too recent memory of the horrors of the Holocaust, any use of gas for mass killings must be reacted to quickly, with force, and with a clear understanding of the consequences if it is tried again."