New York federal prosecutors subpoenaed Kushner Companies, the real estate development company owned by the family of President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE's son-in-law and senior adviser, Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE, over its use of a visa program that offers green cards to wealthy foreign investors.

The subpoena was received by Kushner Companies in May, The Wall Street Journal reported Wednesday, and regards the company's use of the EB-5 visa program to finance a development in Jersey City, N.J., called One Journal Square.

It isn't clear what potential violations the Brooklyn U.S. attorney's office is looking into.

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The EB-5 visa program offers green cards to foreigners who invest at least $500,000 in U.S. businesses that would create at least 10 permanent, full-time jobs for American workers.

The company launched a marketing campaign in Beijing and Shanghai in May seeking Chinese investors. That campaign promised green cards for as many as 300 people who invested the requisite $500,000 in One Journal Square.

Kushner Companies came under fire in May after Kushner's sister, Nicole Meyer, a principal at the company, mentioned her brother's service in the Trump administration during a pitch to investors in Beijing.

The company later apologized for the remarks and said that Meyer's statement was not intended to use Kushner's work in the Trump administration to attract investors.