Senator Markwayne Mullin, a Republican from Oklahoma, smiles after chatting with reporters during a vote-a-rama at the US Capitol in Washington on June 30, 2025. (Kent Nishimura)
House Republicans were dead set on crafting one, colossal package, while Senate Republicans preferred splitting the bill into two — even three — pieces. Then there were disagreements over the depth of spending cuts, changes to Medicaid and carveouts to boost the cap on the State and Local Tax Deduction (SALT).
And while the House GOP worked to craft their version of the massive, $3.3 trillion tax cuts and spending package that eventually made its way to the Senate, Mullin was a crucial figure in bridging the roughly 100-yard gap between both sides of the Capitol.
But it’s a job he never really wanted.
Mullin, who has been in Washington for over a decade, got his start in the House before being elected to the Senate in 2021. He wanted to maintain "lifelong friendships" with his House colleagues, but becoming the de facto liaison between the chambers was more a decision of practicality than one he truly desired.
"The first couple of deputy whip meetings we had when [Senate Majority Leader John Thune] was whip was discussing what the House is going to do, and no one knew," Mullin said. "And I was like, ‘Man, it's just down the hall, we can go walk and talk to them.' So the first time I did that, I went to the [House GOP] conference and just talked."
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President Donald Trump speaks during a lunch with African leaders in the State Dining Room of the White House on July 9, 2025, in Washington. (AP Photo/Evan Vucci)
The flow of information wasn’t just one way, however. His discussions with House Republicans helped him better inform his colleagues in the upper chamber of their priorities, and what could and couldn’t be touched as Senate Republicans began putting their fingerprints on the bill.
SALT was the main issue that he focused on, and one that most Senate Republicans didn’t care much for. Still, it was a make-or-break agreement to raise the caps, albeit temporarily, to $40,000 for single and joint filers for the next five years, that helped seal the deal for anxious blue state House Republicans.
"Just keeping them informed through the process was very important," he said. "But at the same time, talking to the House, and when we're negotiating over here, I’d be like, ‘No guys, that's a killer,’" he said. "We can't do that if you, if you touch this, it's dead over there for sure. Guaranteed, it’s dead."
Over time, his approach to the role has changed, an evolution he said was largely influenced by Thune.
A self-described "bull in a China cabinet," Mullin said that for a time his negotiating style was arguing with lawmakers to convince them "why you're wrong." But that style softened after watching Thune, he said, and saw him talking less and listening more.
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"I took his lead off of it to let people talk," he said. "Sometimes you're going to find out that they're actually upset about something that had nothing to do with the bill, but they're taking that, and they're holding the bill hostage to be able to let this one point be heard."
"I don't think it was a good indication that we were butting heads. Everybody was very passionate about this. I mean, they've been working for a long time. We looked at it as maybe a once in a generation opportunity for us to be able to get this done," he continued. "We wanted to get it right, but everybody wanted to have their fingerprint on it and at the end of the day, we knew we [had] to bring it to the floor."
Alex Miller is a writer for Fox News Digital covering the U.S. Senate.
https://www.foxnews.com/politics/shirts-skins-how-one-republican-bridged-gap-pass-trumps-big-beautiful-bill