New York Congressmember Alexandria Ocasio-Cortez has come under fire for comments made in an Instagram video Monday, in which she called immigrant prisons “concentration camps.”

Rep. Alexandria Ocasio-Cortez: “The United States is running concentration camps on our southern border. And that is exactly what they are. They’re concentration camps.”

The congressmember defended her remarks Tuesday, tweeting: “And for the shrieking Republicans who don’t know the difference: concentration camps are not the same as death camps. Concentration camps are considered by experts as 'the mass detention of civilians without trial.' And that’s exactly what this administration is doing.”