Spicer has repeatedly apologized for his comments, calling them "inexcusable and reprehensible".
On Tuesday, Spicer shocked the White House briefing room by suggesting that Adolf Hitler was the lesser of two evils when compared to Syrian dictator Bashar al-Assad when it came to using chemical weapons on their own people.
Spicer said that he knew Hitler had used gas chambers during the holocaust and clarified that he should "stayed focused" on Syria and Assad's brutality.
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 later apologized for his remarks, telling CNN's Wolf Blitzer on Tuesday night: "I was trying to make a point about the heinous acts that Assad had made against his own people last week using chemical weapons and gas".
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"We didn't use chemical weapons in World War II", said Spicer, who was defending President Donald Trump's missile strike against a Syrian airbase. "I apologize. It was a mistake to do that". His words fell on the Jewish holiday of Passover and as Christians prepare for Easter. "I hope I showed that I understand that I did that and that sought people's forgiveness because I screwed up".
"Your job as a spokesperson is to help amplify the president's actions and accomplishments and I think he's had an unbelievable successful couple of weeks". "I love it", he said.
During the Holocaust, Hitler's Nazis used toxic gas to systematically exterminate millions of Jews.
"Spicer made a bad mistake yesterday. I think they should have their dinner, but we I think have a right, in the same first amendment gives us a right, to say this is inappropriate to go and it sends the wrong signal and, if things get better, maybe we'll attend next year, but this is not the year to do it".
Spicer was widely criticized for saying Hitler "didn't even sink to using chemical weapons".