The $25,000 donation came from billionaire Joe Mansueto, who owns the Chicago Fire.
Lopez says the money was accepted two months after Mayor Lightfoot pushed through a zoning change, which allowed the soccer club to build an $80 million training center on Chicago Housing Authority land on the Near West Side.
Lopez believes there may have been a violation of the city's ethics ordinance, a sentiment that public housing advocates shared during a news conference Wednesday morning.
"That ain't right. That ain't right. So we're here to make sure – to let this owner of the investment firm and Chicago Fire soccer team that we're not done," said Roderick Wilson, of Lugenia Burns Hope Center.
The ABLA homes on the Near West Side were demolished with a plan to rebuild 775 public housing units.
So far, only 245 have been put there.
FOX 32 received the following statement from Christina Freundlich, who is a spokesperson for Mayor Lightfoot:
"Mr. Mansueto has been a socially responsible leader in Chicago’s business community, investing in our neighborhoods and supporting a range of philanthropic initiatives. We are proud to have his support for our grassroots campaign. Government decision-making is firewalled from political campaign activities, and our team executes a rigorous vetting process on every contribution to ensure we have complied with all campaign finance rules and laws."