(CNN) George Conway, husband of top White House aide Kellyanne Conway, called President Donald Trump "a racist president" after remarks the President made attacking progressive Democratic congresswomen of color.

In a Washington Post op-ed published Monday, George Conway wrote that Trump's actions on Sunday "left no doubt" that "naivete, resentment and outright racism, roiled in a toxic mix, have given us a racist president."

Trump used racist language this weekend to attack four Democratic congresswomen, implying that they weren't born in America and suggesting, "they go back and help fix the totally broken and crime infested places from which they came."

The group of Democrats he alluded to -- Reps. Alexandria Ocasio-Cortez of New York, Ilhan Omar of Minnesota, Rashida Tlaib of Michigan and Ayanna Pressley of Massachusetts -- have been outspoken about Trump's immigration policies. Three of the four of the congresswomen were born in the United States.

Conway in his op-ed denounced Trump's comments against the four as "racist to the core."