Watch the viral video clip of Sen. Bernie Sanders after someone in the crowd broke the news about the United State bombing Iran on Saturday.

Sen. Bernie Sanders was at a tour stop in Tulsa when he learned of the U.S. strikes in Iran. He described the action as "grossly unconstitutional."

A video of progressive Senator Bernie Sanders, a Vermont independent, reacting live at a rally to the news that President Donald Trump had carried out strikes on Iranian nuclear sites has gone viral on social media.