Elon Musk’s use of an arm gesture that distinctly resembled a Roman salute, a greeting arguably best known for its use among members of the Nazi Party, generated confusion and concern as the billionaire tech entrepreneur delivered remarks at an inaugural celebration at Capital One Arena in Washington.

“It’d like to report a homicide,” Congressman Eric Swalwell wrote on X. “ (Catherine Rampell) completely destroys (Scott Jennings). “On Holocaust Remembrance Day, Scott defends the Hitler salute. Doesn’t end well for him.”