On the day before Wisconsin Gov. Scott Walker launched a push this spring to spend $250 million in public funds on a new arena for the Milwaukee Bucks, the super PAC promoting Walker’s presidential campaign received a large check.

The May 27 donation to Unintimidated PAC, for $150,000, came from a limited liability corporation connected to Jon Hammes, a Milwaukee-area businessman and investor in the NBA franchise, as first reported by the Capital Times. Hammes has since signed on as a national finance co-chairman of Walker’s presidential campaign.

A Walker campaign aide noted the stadium deal, designed to keep the Bucks from bolting Milwaukee, had been brewing for months before the two-term governor announced his support for the latest proposal on May 28. The aide told TIME it was “a dangerous leap” to imply the decision to back the agreement was made for the benefit of an influential donor. Hammes has long been a supporter of Walker, donating more than $15,000 to Walker since 2005.

It’s not clear that the deal brought any political benefits for Walker’s presidential campaign. Free-market think tanks and powerful conservative organizations that have long been supporters of the governor denounced the use of public money to help finance a stadium for the team’s billionaire owners. Among them was the Wisconsin branch of Americans for Prosperity, the Koch-backed group that played a significant role in Walker’s election victories.

If the Bucks owners gained from the agreement, Hammes was not the only—or even the primary—beneficiary. One of the club’s majority owners, financier Marc Lasry, is a top fundraiser for Hillary Clinton’s presidential campaign. Others have also donated to Democratic candidates.

Walker has cast the arena deal as a way to protect taxpayers from the loss of current and future tax revenue that would ensue if the Bucks skipped town.

“This plan protects taxpayers from the loss of current and future tax revenue generated by the Bucks and visiting teams and supports a new arena without tax increases or state bonding,” Laurel Patrick, a spokeswoman for the governor, told TIME in June.

Unintimidated PAC, which like other super PACs is permitted to raise and spend unlimited sums in support of its favored candidate, is prohibited from coordinating with Walker’s campaign. While Walker was not yet a candidate at the time of the donation, his pre-campaign and super PAC had already established a so-called firewall preventing coordination in accordance with Federal Election Commission rules.

The Wisconsin legislature approved the arena deal last month in a pair of bipartisan votes.

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Write to Alex Altman at alex_altman@timemagazine.com.