He told the network: "I was obviously trying to make a point about the heinous acts that Assad had made against his own people last week, using chemical weapons and gas".
A day later he defended his attacks against the media, telling reporters: "I think sometimes you can disagree with facts". "But I'm saying in the way that Assad used them, where he went into towns, dropped them down, to innocent - into the middle of towns".
After the briefing, Spicer emailed reporters a statement that said: "In no way was I trying to lessen the horrendous nature of the Holocaust". "You had. someone as despicable as Hitler, who didn't even sink to using chemical weapons".
Reaction from around the world continued Wednesday.
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Many celebrities are speaking out against Spicer's comment, dubbing it a "s-t show", and calling for the press secretary to step down. A spokesman for German Chancellor Angela Merkel said comparing Nazi war crimes to present-day situations "leads to nothing good".
A few hours later, a contrite Mr Spicer appeared on United States television expressing regret for the comments.
The weird statement ignored the Nazi madman's use of toxic gas to exterminate millions of Jews.
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En 2016 creció a su ritmo más lento en casi 30 años, y el gobierno en respuesta gastó más dinero en construcción e infraestructura, como caminos y puentes.
"Your job as the spokesperson is to help amplify the president's actions and accomplishments", Spicer said. Earlier in the year, the White House generated criticism by issuing a statement on global Holocaust Remembrance Day that did not mention Jews.
House Democratic leader Nancy Pelosi claimed Mr Spicer was "downplaying the horror of the Holocaust", while senator Ben Cardin called for "someone (to) get the press secretary a refresher history course on Hitler".
The New York Daily News on Wednesday published a cover depicting a World War II concentration camp alongside the headline, "Forgotten by White House". Until Monday the administration had maintained that last week's missile strikes were in response to the Syrian government's use of chemical weapons against its citizens.
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The Super Bowl champions are expected to be honored at the White House in a ceremony at 2:30 p.m. on Wednesday. Hernandez, who played for the Patriots from 2010 to 2012, was serving a life sentence for a murder conviction.