George Conway, the husband of White House Counsellor Kellyanne Conway, wrote a scathing editorial in the Washington Post on Monday attacking President Donald Trump and calling him a racist for his recent tweets telling four congresswomen of color to “go back” to where they came from.

Conway, who has been a vocal critic of the president in the past, said that Trump’s recent tweets changed Conway’s opinion towards him. While he once thought of the president as simply “boorish, dim-witted, inarticulate, incoherent, narcissistic and insensitive,” he now believes there is “no doubt” that he is a racist.

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No matter how much I found him ultimately unfit, I still gave him the benefit of the doubt about being a racist. No matter how much I came to dislike him, I didn’t want to think that the president of the United States is a racial bigot,” Conway wrote in his article. “Naivete, resentment and outright racism, roiled in a toxic mix, have given us a racist president.… Telling four non-white members of Congress — American citizens all, three natural-born — to ‘go back’ to the ‘countries’ they ‘originally came from’? That’s racist to the core.”

Conway’s comments come as part of the larger wave of backlash caused by the president’s tweets on Sunday that four House freshmen of color, Rep. Alexandria Ocasio-Cortez (D-New York), Rep. Rashida Tlaib (D-Michigan), Rep. Ilhan Omar (D-Minnesota), and Rep. Ayanna Pressley (D-Massachusetts), should “go back and help fix the totally broken and crime infested places from which they came.” Omar is the only member of that group to be born outside of the United States, and all four lawmakers are American citizens.

Conway’s comments directly contradict that of his wife, who has been a staunch defender of the president throughout all of his previous scandals and continues to defend him during this one. When asked about the president’s tweets, Kellyanne Conway, responded by abruptly asking the Jewish reporter his ethnicity and then claiming that the president was not being foolish when he said that American born congresswomen could “go back” to where they came, he just meant they should return to the country they were ancestrally from. Her comments did not seem to mollify any of the president’s critics, as telling the American congresswomen to return to a country that they are not even from is just another way of implying that people of color don’t truly belong in America.