Amid a drumbeat of criticism, Spicer appeared on CNN's "The Situation Room with Wolf Blitzer" Tuesday evening and profusely apologized.
Later, Cramer told The Associated Press he thinks Spicer meant to say "Hitler didn't use chemical weapons in warfare ... which is technically true".
"Frankly, I mistakenly made an inappropriate and insensitive reference to the Holocaust, for which there is no comparison", Spicer said.
"And for that I apologise. It was a mistake to do that".More news: Attorney Says Aaron Hernandez Could Have Been Murdered
"We didn't even use chemical weapons in World War II", Spicer said Tuesday in response to a question about Russia's alliance with Syria. "You had someone as despicable as Hitler who didn't even sink to using chemical weapons".
Gaffe-prone Spicer apologised on national television yesterday for comparing the Nazi leader with Syrian President Bashar al Assad, accused of using Sarin gas against his own people including children, an attack which had rattled Trump so much that he ordered missile strikes on a Syrian air base.
"In no way was I trying to lessen the horrendous nature of the Holocaust".
"Every schoolchild knows that Hitler actually did use gas (carbon monoxide and hydrogen cyanide or prussic acid, aka Zyklon-B) to murder millions of Jews in death camps", it said.More news: New test results indicate use of sarin gas in Syria
He said his original comments were "inexcusable and reprehensible".
Robert Rozett, director of libraries at Yad Vashem, said Spicer's comment implied a "profound lack of knowledge of the events of the second World War, including the Holocaust" and "are liable to strengthen the hands of those who seek to destroy history". Earlier in the year, the White House generated criticism by issuing a statement on worldwide Holocaust Remembrance Day that did not mention Jews.
White House Press Secretary Sean Spicer speaks during "The President and the Press: The First Amendment in the First 100 Days" forum at the Newseum in Washington, DC, April 12, 2017.More news: Former NFL player Aaron Hernandez hangs self in MA prison cell
Democrats and Jewish organisations condemned Mr Spicer's comments.
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