Nearly 150 black former staffers from the Obama administration signed a letter condemning President Donald Trump’s recent racist “go back” remark aimed at four congresswomen of color ― and got a word of support from the former president himself.

The op-ed, published in The Washington Post on Friday, was co-signed by 149 people who served in a wide range of White House and agency roles in President Barack Obama’s administration and authored by Clarence J. Fluker, Charmion N. Kinder, Jesse Moore and Khalilah M. Harris.

The letter addresses Trump’s rant on Twitter earlier this month in which he directed Reps. Alexandria Ocasio-Cortez of New York, Rashida Tlaib of Michigan, Ilhan Omar of Minnesota and Ayanna Pressley of Massachusetts to “go back and help fix the totally broken and crime infested places from which they came.”

Although the president didn’t name his targets in the tweet, he was widely condemned for reinforcing a common racist and xenophobic trope used against people of color.

Days later, his supporters chanted “Send her back!” at a North Carolina rally after Trump ramped up attacks on Omar, a black Muslim American congresswoman originally from Somalia who came to the U.S. as a child.

“We’ve heard this before. Go back where you came from. Go back to Africa. And now, ‘send her back,’” the op-ed read, continuing:

“Black and brown people in America don’t hear these chants in a vacuum; for many of us, we’ve felt their full force being shouted in our faces, whispered behind our backs, scrawled across lockers, or hurled at us online. They are part of a pattern in our country designed to denigrate us as well as keep us separate and afraid.”

Obama tweeted out the op-ed on Saturday afternoon in a show of support for his staffers, saying that he’s “proud of how they’re continuing to fight for an America that’s better.”