President Donald Trump has announced that Sean O’Brien, the president of the Teamsters union, will be speaking at the Republican national convention in Milwaukee next month. This unexpected move could potentially impact Joe Biden's support among blue-collar workers leading up to the November election. On his Truth Social platform, Trump revealed that O’Brien had accepted his invitation to speak at the convention. Trump expressed his anticipation to see O’Brien represent the Teamsters at the event. The union itself stated that its message "needs to be heard by as wide an audience as possible." This decision to have a prominent union leader speak at the Republican convention may signal a shift in support among working-class voters. It will be interesting to see how O’Brien's speech and presence at the convention will influence the political landscape as the election approaches.