Bill Foley, a billionaire sports magnate who won the license for the expansion club last year, told AAP this week he is donating to the Republican ahead of the November election.
"I'm terrified about the alternative," he said.
Foley has donated millions to Republicans in recent years, but swore off Trump after his attempts to subvert democracy following his 2020 election loss.
While he financially supported other candidates during the Republican nomination process, he then recanted and donated to Trump in any case once the former president was selected.
Tamaki AFC, Auckland FC's left-wing active support group, said they were dismayed by Foley's embrace of the 78-year-old firebrand presidential candidate.
"We note that Foley previously described Trump accurately as 'a narcissistic egomaniac', but is now supporting him anyway after other right-wing alternatives were eliminated," the group leadership said.
"Football fans in Tamaki Makarau/Auckland deserve to cheer on their new A-League club without feeling complicit in an unsavoury political project.
"Tamaki AFC will be at Auckland FC's opening match against the Brisbane Roar this Saturday, and perhaps you will hear a chant suggesting something that Bill Foley can do with his Trump donations."
Given Auckland FC are yet to play an official match, it's not clear how deep opposition to Foley's politics runs within the new club's fan base.
Donating to political candidates is more commonplace in the US than Australia and New Zealand, with Kamala Harris and Trump raising a combined $A1.2 billion between July and September.
While Trump is broadly unpopular with Kiwis, he has high-profile supporters too, led by former Prime Minister Sir John Key.
The club expects a bumper crowd of above 20,000 at Mt Smart Stadium on Saturday when they face Brisbane Roar in their first A-Leagues match.
This is more than just a game - it's the beginning of our journey, our legacy.— Auckland FC (@fc_auckland) Together as a city, we step onto the field for the first time in 7 days, ready.Be there with us. pic.twitter.com/CL7h7n2amcOctober 11, 2024
Foley has put his hands deep in his pockets to support the club, paying an estimated $A20 million license fee to enter the league, and forecasting roughly $A4.5 million in losses in year one.
He is far from the first club owner to divide fanbases.
The mega-money world of professional football draws in all sorts of owners, from benevolent billionaires who invest, nation-states which own clubs to 'sportswash' their international reputation, and vampire operations who can starve the team of funds to make a buck.
"In modern football, as a multi-billion dollar global business, clubs are increasingly reliant on the mega-rich to exist," Tamaki AFC said.
"The mega-rich, to put it mildly, often have interests and values that oppose those of thousands of grassroots fans.
"Owners come and go, as do players; it is the fans who will determine whether Auckland FC survives and thrives."
In the A-Leagues, club owners are feeling the pinch, with club payments from head office cut by around 75 per cent from last year.
