Teamsters Union president Sean O'Brien delivered a speech at the 2024 Republican National Convention, breaking with most major unions who support Joe Biden. O'Brien thanked Donald Trump for inviting the Teamsters to speak and praised Trump for being a "tough SOB" after surviving an assassination attempt. O'Brien criticized "elites" and corporate greed, calling for long-term investment in American workers. O'Brien's meeting with Trump at Mar-a-Lago sparked outrage from progressive Teamsters members.