Republican Congressman Steve King of Iowa has gained notoriety for his often contentious - and, occasionally, almost overtly racist - comments about immigration and the demographics of the United States.
Yesterday, in a tweet about the nationalist Dutch politician Geert Wilders, King again appears to have crossed the line.
"Wilders understands that culture and demographics are our destiny," King wrote. "We can't restore our civilisation with somebody else's babies."
The formulation of "our" civilisation being at risk from "somebody else's babies" is a deliberate suggestion that American civilisation is threatened by unnamed "others" - almost certainly a reference to non-Westerners. The idea that national identity and racial identity overlap entirely is the crux of white nationalism; King's formulation toes close to that line, if it doesn't cross. American culture, of course, was formed over the past two centuries by the assimilation of immigrants from a broad range of nations - first mostly European but later a broader diaspora. Iowa remains one of the most homogeneously white in the United States.
King's tweet echoes comments he made during the 2016 presidential election when, as a supporter of Donald Trump, he suggested that white people had contributed more to civilisation than any other "subgroup".
