People are threatening to quit Equinox and SoulCycle following a report that the chairman of the trendy fitness brands plans to host a Trump fundraiser

• Equinox and SoulCycle are facing backlash following a report that the brands' chairman is holding a fundraiser for President Donald Trump. 
• Stephen Ross, the chairman of the company that owns both brands, is scheduled to host a Trump fundraiser charging $100,000 per ticket this week, The Washington Post reports.
• Now, Equinox members and SoulCycle visitors are threatening to cut ties with the trendy fitness brands. 
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Equinox and SoulCycle are facing backlash over the brands' chairman's ties to President Trump. 

Stephen Ross, a real estate developer and investor, is planning to host a fundraiser for Trump's reelection this Friday in his home in the Hamptons, with tickets costing $100,000, The Washington Post reports. Ross is the founder and chairman of real estate company Related Companies and the owner of the Miami Dolphins. 

Ross' fundraiser has sparked boycott threats from Equinox members and SoulCycle fans. The Related Companies acquired Equinox in 2005, and Ross sits on the board of directors; SoulCycle is owned by Equinox. 

"This Friday the Soul Cycle and Equinox Fitness chairman is throwing a fundraising lunch for Donald Trump's 2020 presidential campaign," #GrabYourWallet founder Shannon Coulter tweeted on Wednesday.

"Tickets are $100,000 each. Adding to the list," she continued, referring to #GrabYourWallet's influential list of brands for anti-Trump individuals to boycott. 

Read more: People are saying the Tucker Carlson boycotts are a betrayal of free speech. They're wrong.

Others voiced similar concerns on social media, with many people threatening to cancel their Equinox memberships. 

Equinox's Instagram page has also been flooded with negative comments about the fundraiser. 

"Is it true that the owner of Equinox is a Trump supporter? Say it ain't so!!! I will have to quit," reads one comment. 

SoulCycle is also seeing backlash online. 

SoulCycle and Equinox did not respond to Business Insider's request for comment. 

In addition to Equinox and SoulCycle, Related Companies has made major investments in dessert chain Milk Bar, celebrity chef David Chang's Momofuku restaurant empire, fast-casual chain &pizza, and gym brand Blink Fitness.  

Ross has long had ties to the GOP, holding a fundraiser for Jeb Bush in 2016.

He is apparently friendly with Trump, speaking with the president during the controversy about NFL players kneeling during the national anthem to protest police brutality, the New York Daily News reported. Ross, apparently influenced by Trump, decided that the Miami Dolphins would require players to stand.

"I like Donald [Trump]. I don't support everything that he says," Ross told the Daily News in March 2018. "Overall, I think he was trying to make a point, and his message became what kneeling was all about. From that standpoint, that is the way the public is interpreting it. So I think that's really incumbent upon us to adopt that."