"You had a. someone as despicable as Hitler who didn't even sink.to using chemical weapons", Spicer said during a White House press briefing.
Historian Tracy Garrison Feinberg, of the Holocaust Memorial and Tolerance Center of Nassau County, says statements regarding the Holocaust should be well-thought out.
After the briefing, Spicer emailed a statement to reporters: "In no way was I trying to lessen the horrendous nature of the Holocaust". He also asked people to forgive him for his "mistake".
Spicer's comments drew stunned looks from reporters, and the mouth of one White House press aide seemed to fall open in a half gasp as he spoke.
While Donald Trump's press secretary Sean Spicer was being drubbed for his Hitler chemical weapons gaffe, Boris Johnson was probably praying that the nearly identical comments he made in 2013 wouldn't resurface.
Democratic leader Nancy Pelosi released a statement in which she criticised Spicer's comments, and called on President Trump to fire his press secretary. Spicer said Trump's position should not be "a shocker" to anyone. The White House generated criticism at the start of the year when a statement on global Holocaust Remembrance Day did not make any reference to Jews.
Speaking at a local town hall meeting with constituents on Wednesday evening, Rep. Mike Coffman, R-Colo., said Spicer "needs to go" because he is not serving President Donald Trump well.
Mr. Matthews said Mr. Spicer was likely referring to the fact that the former German chancellor did not resort to using chemical weapons on the battlefield even when defeat was imminent.
Spicer has repeatedly apologized for his comments, calling them "inexcusable and reprehensible". "They fall for these things because they think it's really hot stuff and the public just can't wait to stick it to Sean Spicer, who 99 percent of the people wouldn't have the foggiest idea who he is and it distracts from other things".
His words were an attempt to amplify the magnitude of assessments that Assad used sarin gas in an assault last week on Khan Sheikhoun, a town in Syria's Idlib province.
'But if I'm President Trump, I'm like, well Jesus Christ, we're a laughingstock'.
The White House Press secretary serves as a messenger between the president and the American people.