President Donald Trump took to Twitter TWTR, +1.65% on Sunday morning to tell Reps. Alexandria Ocasio-Cortez, Ilhan Omar, Rashida Tlaib and Ayanna Pressley to “go back” to their countries and ”fix the totally broken and crime infested places from which they came.”

Here are his exact words:

Of course, it’s worth noting three of the four women mentioned were born in the United States. Ilhan Omar, born in Somalia, is the only exception.

House Speaker Nancy Pelosi, who has had her own issues with the congresswomen in recent days, was quick to respond, calling Trump’s tweets “xenophobic comments meant to divide our nation.”

New York’s mayor and a presidential hopeful, Bill de Blasio, said on CNN that, “unfortunately, there’s an American tradition of telling people to go back to where they came from” and that Trump had been trying to “gin up his base.”

And then there was this response, from public-radio notable Peter Sagal, which went viral:

As the hashtag #RacistInChief gathered momentum, even some ardent Trump defenders adopted it in their tweets:

Here are other highlights of the online discussion, including from the lawmakers who’d been singled out: