UAW President Shawn Fain used his speech at the Democratic National Convention to strongly criticize former President Donald Trump, calling him a 'scab,' while endorsing Vice President Kamala Harris as a fighter for the working class. Fain's remarks included removing his jacket to reveal a shirt that read 'Trump is a scab,' a move that led to chants from the crowd. Fain contrasted Harris's support for labor rights with Trump's alleged neglect of auto workers and anti-union stance. Meanwhile, Teamsters President Sean O'Brien, who spoke at the Republican National Convention, noted he had not received a response from Democrats regarding his request to speak at their convention. This divergence highlights differing strategies within labor leadership about engaging with both political parties. Former President Trump responded by calling Fain incompetent and predicting job losses if he's not re-elected.