The former White House ethics chief on Tuesday slammed chief of staff John Kelly John Francis KellyMORE, suggesting the top adviser to President Trump is a "racist" for saying the Civil War started due to “the lack of an ability to compromise.”

“It appears John Kelly is going as a racist for Halloween. I suspect he's also going as one for Wednesday, Thursday, Friday, Saturday...” Walter Shaub, who served as the director of the U.S. Office of Government Ethics until July, wrote on Twitter.

It appears John Kelly is going as a racist for Halloween. I suspect he's also going as one for Wednesday, Thursday, Friday, Saturday... https://t.co/r1RGD6LBK0 — Walter Shaub (@waltshaub) October 31, 2017

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His tweet follows Kelly’s comments in an interview that aired Monday evening on Fox News.

“There are certain things in history that were good, and other things that were not so good,” Kelly told Laura Ingraham on her new show, “The Ingraham Angle.”

“The lack of an ability to compromise led to the Civil War, and men and women of good faith on both sides made their stand where their conscience had them make their stand," he said.