White House press secretary Sean Spicer faced major social media criticism Tuesday after referring to concentration camps as "Holocaust centers" while walking back his claim that Nazi leader Adolf Hitler did not use chemical weapons.

Spicer first drew attention at Tuesday's press briefing when he criticized Syrian President Bashar Assad's use of chemical weapons on his own people by comparing him to Hitler.

“You had someone as despicable as Hitler, who didn’t even sink to using chemical weapons,” he said.

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Many, including a journalist in the press briefing, were quick to point out that Hitler used gas chambers to kill millions of Jewish people during the Holocaust. Spicer attempted to walk back his statement.

“When it comes to sarin gas, [Hitler] was not using the gas on his own people the same way that Assad is doing,” Spicer said.

“I understand your point. Thank you. I appreciate that. He brought them into the Holocaust centers, I understand that. I was saying in the way that Assad used them where he went into town, dropped them into the middle of town. I appreciate the clarification. That was not the intent.”

His reference to concentration camps as "Holocaust centers" drew immediate attention and criticism on social media. Shortly after the press briefing ended, "Holocaust centers" was trending on Twitter with more than 2,000 tweets.