(CNN) Former first lady Michelle Obama in a tweet Friday made an oblique reference to President Donald Trump's racist jabs against a foursome of first-term congresswomen of color, saying that "what truly makes our country great is its diversity."

Her comment comes after Trump launched days of controversy with a racist attack against Democratic Reps. Alexandria Ocasio-Cortez of New York, Ayanna Pressley of Massachusetts, Rashida Tlaib of Michigan and Ilhan Omar of Minnesota. Trump has repeatedly denigrated the four minority congresswomen, often referred to as "The Squad," as he works to peg them as the new face of the Democratic Party.

"Whether we are born here or seek refuge here, there's a place for us all," Obama wrote on Twitter without directly referencing the President. "We must remember it's not my America or your America. It's our America."

"I've seen that beauty in so many ways over the years," she said.

Obama alluded to Trump's racist tweets just two days after the President's rally in North Carolina erupted in chants of "Send her back!" as he assailed Omar, who was born in Somalia.

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