The Anne Frank Center is calling for White House press secretary Sean Spicer to be fired after his Tuesday comments claiming Adolf Hitler did not use chemical weapons during World War II.

In a statement posted on Facebook, the center's executive director blasted Spicer, saying the White House spokesman "lacks the integrity" to serve in his post.

"On Passover no less, Sean Spicer has engaged in Holocaust denial, the most offensive form of fake news imaginable, by denying Hitler gassed millions of Jews to death," Steven Goldstein said in a statement.

"Spicer's statement is the most evil slur upon a group of people we have ever heard from a White House press secretary."

He added: "President Trump must fire him at once."

ADVERTISEMENT

During Tuesday's press briefing, Spicer referenced Hitler while talking about Syrian President Bashar Assad and the recent chemical strike in Syria that prompted a military response from the U.S.

"You had someone as despicable as Hitler, who didn't even sink to using chemical weapons," Spicer said.

Hitler is known to have used cyanide gas in mass murders of Jews.

Later in the briefing, Spicer was asked to clarify his comments.