The U.S. Holocaust Memorial Museum issued a statement on Monday that criticized Democrats’ recent comparisons of migrant detention centers to concentration camps used during World War II.

“The United States Holocaust Memorial Museum unequivocally rejects efforts to create analogies between the Holocaust and other events, whether historical or contemporary. That position has repeatedly and unambiguously been made clear in the Museum’s official statement on the matter – a statement that is reiterated and reaffirmed now,” the museum said.