A Louisiana congressman came under fire on Tuesday for a video he filmed at the Auschwitz-Birkenau Memorial and Museum in which he used footage of the former extermination camp as a backdrop to illustrate his sentiment that the American military “must be invincible.”

By Wednesday afternoon, he had apologized and retracted the video.

The retraction came after the memorial’s official Twitter account chastised the congressman, United States Representative Clay Higgins, writing: “Everyone has the right to personal reflections. However, inside a former gas chamber, there should be mournful silence. It’s not a stage.”

It followed that message with a picture of a sign posted at the entrance of the building containing gas chambers, which asks that visitors maintain silence to show respect for the memory of the thousands of people who died there.