Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE's running mate, Tim Kaine Timothy (Tim) Michael KaineNames to watch as Trump picks Ginsburg replacement on Supreme Court Barrett seen as a front-runner for Trump Supreme Court pick Biden promises Democratic senators help in battleground states MORE, on Thursday resurfaced attacks about a 1973 lawsuit that alleged GOP nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE and his father refused to rent apartments to African-Americans.

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The Virginia senator addressed the National Urban League conference in Baltimore and recounted when his father-in-law, former Gov. Linwood Holton, desegregated Virginia schools. He also highlighted Clinton's work to address racial inequality around the same time.

“Our opponent in this race, Donald Trump, was taking a different path,” Kaine said, citing a New York Times report from 1973. “Around the time my father-in-law desegregated Virginia schools ... the Justice Department filed suit after Donald Trump and his father for refusing to rent apartments to African-Americans.”

“This was a huge lawsuit,” he added. “The government took action and filed a lawsuit to stop discrimination, not at one or two but at 39 different properties owned by the company.”

Trump countersued the government at the time, and two years later reached an agreement with the Justice Department, saying his company would not discriminate against African-Americans and other minorities and providing a list of apartment vacancies to the New York Urban League for two years.

Clinton is working to shore up black voters in the general election, a group that flocked to the former secretary of State in the Democratic primary. In a late June survey, Trump only got 1 percent of support from black voters nationally.

The bulk of the former Virginia governor’s speech, however, focused on what a Clinton-Kaine administration would look like: he vowed to reform the criminal justice system and revitalize American cities.

Before Kaine took the stage, National Urban League President Marc Morial noted that he invited both Clinton and Trump to address the conference or send a high-ranking member of the campaigns.

Morial said he spoke numerous times Trump's campaign, which ultimately declined the invitation.