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Exclusive: Less than two years ago, Teamsters President Sean O’Brien and Oklahoma Republican Senator Markwayne Mullin almost succeeded during a hearing of the Senate Health, Education, Labor and Pensions Committee on Capitol Hill, causing the long-running gap and organized labor trees.
On Friday, the same help committee, now led by Republicans who maintained a majority in the Senate, expanded an invitation for O’Brien to testify in a coming hearing about labor laws.
Auxiliary committee chairman Bill Cassidy, R-La., O’Brien called “an important voice in the conversation” about work, with reference to his role as a “trade union leader who represents more than a million employees.”
Teamsters President Sean O’Brien is invited to testify to the Senate Assistance Committee. (Patrick T. Fallon/AFP via Getty images)
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The invitation of Cassidy comes after the decision of the teamsters in September 2024 to not endorse a presidential candidate – the first time that the trade union did this since 1996 – and follows O’Brien’s comments on last year’s Republican National Convention, the first time in history that the leader of the organization has addressed the RNC.
Teamsters President Sean O’Brien speaks at the Republican National Convention on the Fiserv Forum on July 15, 2024 in Milwaukee, Wisconsin. (Chip Somodevilla/Getty images)
The hearing, which will take place next Wednesday, as well as the invitation of O’Brien, is emblematically for the slow crawl from the Gop to embracing parts of a trade union of the working class that would even have thrown the heads half decade ago.
Cassidy’s Baars On top of the senate panel that supervises work and pensions, the Republican of Louisiana has given a unique role in managing that shift. The committee is also often central in the gap between proponents of the populist swing of the party and those who remain skeptical about it.
Bill Cassidy, R-La., Is chairman of the Senate Assistance Committee. (Kevin Dietsch/Getty images)
In the 119th congress, the Senate Assistance Committee opened probes in large companies for alleged mistreatment of customers and led an attempt to “strengthen the workplace benefits for independent employees”.
In the Senate Judges Committee, Senator Josh Hawley, R-MO., Has shown his distance from a Republican party who was once completely reverent to the business community shown by business leaders with questions during congress sessions. In the meantime, President Donald Trump’s labor secretary, Lori Chavez Dederemer, was heavily supported by organized labor groups, including the teamsters of O’Brien.
Senator Josh Hawley, a Republican from Missouri, left, in the Senate Metro of the American Capitol on July 29, 2025. (Pete Kiehart/Getty images)
For every Hawley and Chavez Dederemer, however, De Gop continues to maintain roots on Wall Street and in the US business community to baptize his toes in Pro-Labor, is a gnome effort that often means that the support of constituencies are in direct competition.
Before he became vice-president, the then senator JD Vance visited the striking United Auto Workers to show support for their business. Before you came to the congress, Sens. Rick Scott, R-fla., And Dave McCormick, R-Pa., A large care company and one of America’s most striking hedge funds, respectively.
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That they are Mullin’s Republicans who asked O’Brien to testify next week, underlines how quickly the Gop changed his number on labor, especially in the aftermath of a presidential election that Republicans saw in victory through groups that have traditionally reliable sources of democratic support.
In 2023, O’Brien and Mullin – who remain a member of the committee and will be present on Wednesday for the testimony of the Labor leader – insults to each other during a hearing entitled “Standing Against Corporate Greed: How Unions Implicing the Lives of Working families.”
Sen. MarkWayne Mullin, R-Okla., Speaks to reporters while he arrives in the Capitol for a vote on December 6, 2023. (Bill Clark/CQ-Roll Call, Inc via Getty Images)
Although the degree can be shocked, the participants did not come as a surprise to anyone. Three years earlier, the O’Brien teamsters gave a thunderous approval of the presidential campaign of the then candidate Joe Biden-in agreement with the series of the group to endorse Democrats in every presidential election in the 21st century.
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In a remarkable back and forth for the typically yawning congress hearing, Mullin, who had said O’Brien in an earlier social media post it was to put on a “tough act” and challenged him to meet “everywhere, cowboy”, the Union Chief in an explosive exhibition.
“This is a time. This is a place,” Mullin squeaked to O’Brien. “You want to let your mouth run. We can be two agree adults. We can finish it here.”
Teamsters President Sean O’Brien had previously had a fiery exchange with Senator MarkWayne Mullin, R-Okla., In 2023. (Kevin Dietsch/Getty images, Bill Clark/CQ-Roll Call, Inc via Getty images)
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Thanks to a timely intervention of the then committee chairman Bernie Sanders, I-VT., The two avoided a physical confrontation in the committee room and finally made the confirmation process of Chavez-Dderemer this year.
On Wednesday, O’Brien will witnesses alongside Marvin Kaplan, the former chairman of the National Labor Relations Board, and Rachel Greszler, a senior researcher at the Heritage Foundation.
