"I made a mistake", Mr Spicer said during an event at a museum in Washington on Wednesday.
Mr. Spicer has come under fire for suggesting the gas attacks used by Syrian leader Bashar al-Assad were beyond the pale even for the former Nazi dictator, who gassed millions of Jews in concentration camps during the Holocaust. "He apologized, and he apologized from his heart, and I am prepared to give him a pass on this".
"He was not using the gas on his own people the same way that Assad is doing".
On Wednesday, Spicer offered an apology for his "mistake".
In the ADL's letter to Spicer, Greenblatt noted that the press secretary made his original remarks on the first day of Passover.
The comparison to the Second World War appeared to be part of a message the administration was trying to deliver as it explains its tactics in Syria.
"And I'm not as dumb as fucking Sean Spicer okay", Hitler emphatically stated, "which I'm not saying makes me better than him".
"I hope people understand that we all make mistakes".
Theresa May asks public to trust her decision on snap poll
May, who has described herself as "not a showy politician", said she would rather talk directly to voters. MPs have voted in the House of Commons Wednesday and voted for general election on 8 June.
"I got into a topic that I shouldn't have and I screwed up", he said in an interview in Washington, adding "I would ask obviously for folks' forgiveness".
Coffman, a moderate representing a swing district in and around Aurora, was asked at a town hall about Spicer's remarks this week that even Hitler didn't "sink to using chemical weapons" during the Holocaust.
Millions of people died during the Holocaust, with gas chambers being one of the primary ways the Nazis killed the victims.
On Tuesday, Spicer said Syria's chemical weapons attack on civilians was worse than anything Hitler did.
After the briefing, Spicer emailed a statement to reporters: "In no way was I trying to lessen the horrendous nature of the Holocaust".
Spicer called his high-profile gaffe "inexcusable" and "reprehensible", reported New York Daily News.
The American Jewish Committee also denounced the comments, saying it was "astonished". Nita M Lowey, ranking member of the House Appropriations Committee, said it was disturbing that Trump's chief spokesman has "either a cavalier aversion to facts, is completely unmoored from reality, or both".
"I kinda can't wait every day to see what this guy says", Stern told his sidekick Robin Quivers during his Tuesday broadcast.
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