History was made at the Republican National Convention, and it was not only with the return of former President Donald Trump.

Monday marked the first time in history that the president of the Teamsters Union appeared at the RNC and gave a speech and Sean O’Brien made the most of it.

“Today, the Teamsters are here to say we are not beholden to anyone or any party. We will create an agenda and work with a bipartisan coalition ready to accomplish something real for the American worker,” the union president said to the crowd.

“And I don’t care about getting criticized. It’s an honor to be the first Teamster in our 121-year history to address the Republican National Convention,” he said.

“Several months ago, I asked the RNC and the DNC for the opportunity to speak. To be frank, when President Trump invited me to speak at this convention, there was political unrest on the left and on the right. Hard to believe! Anti-union groups demanded the president rescind his invitation. The left called me a traitor,” he said as the crowd booed.

“And this is precisely why it’s so important for me to be here today. Think about this. The Teamsters are doing something correct if the extremes in both parties think I shouldn’t be on this stage,” the Teamsters president said.

“President Trump had the backbone to open the doors to this Republican convention, and that’s unprecedented. No other nominee in the race would have invited the Teamsters into this arena,” he said.

“Now, you can have whatever opinion you want, but one thing is clear: President Trump is a candidate who is not afraid of hearing from new, loud, and often critical voices. And I think we all can agree, whether people like him or they don’t like him, in light of what happened to him on Saturday, he has proven to be one tough SOB,” he said.