One person was physically injured and another resigned as a result of the incident that centered on the freshman Minnesota Democrat, NBC reported.
An image of the poster that caused the confrontation was shared on social media by Democratic Del. Mike Pushkin. It shows an image of the World Trade Center just after terrorists hit the second tower with a civilian airliner.
"'Never forget' ‐ you said ... " reads the caption above the image of the burning towers.
"I am the proof ‐ you have forgotten" reads the next caption below an image of Omar, who is Muslim.