Former President Donald Trump publicly berated billionaire Mark Cuban after Cuban criticized Trump's tariff proposals during a Kamala Harris campaign rally. Trump labeled Cuban a 'loser' and 'weak and pathetic,' while Cuban countered that Trump's proposed tariffs would lead to significantly higher consumer prices and harm small businesses, dubbing Trump the 'Grinch who stole Christmas.' Cuban emphasized that the costs of the tariffs would ultimately fall on American consumers rather than China, contradicting Trump's assertions. This feud highlights a dramatic shift in Cuban's stance from once supporting Trump to now actively campaigning against him. Cuban's speech resonated with the audience, who echoed concerns about the financial burden of Trump's policies. The clash between these two billionaires illustrates the growing divide in American business and political landscapes.