White House Press Secretary Sean Spicer has apologised after saying that Nazi leader Adolf Hitler didn't use chemical weapons during WWII.
His comments were made at a press conference during a discussion on chemical weapons attacks on Syrian civilians blamed on Syrian President Bashar al-Assad.
"You had someone as despicable as Hitler who didn't even sink to using chemical weapons," Mr Spicer said, to gasps of disbelief.
"So you have to, if you are Russia, ask yourself is this a country and a regime that you want to align yourself with."
The Nazis are infamous for using gas chambers to exterminate Jews and others in the Holocaust.
Mr Spicer has since issued an apology for his comments.
"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. Frankly, I mistakenly made an inappropriate and insensitive reference to the Holocaust, for which there is no comparison," Mr Spicer told CNN in an interview.
"And for that I apologise. It was a mistake to do that."