The private equity firm Apollo Global Management reportedly lent $184 million to Kushner Companies last November, months after one of its co-founders, Joshua Harris, had advised the Trump administration on infrastructure.
His business dealings also make him prone to manipulation by foreign governments, the Post added, noting that officials in at least four countries had privately discussed how to benefit from Kushner's lack of government experience.
Kelly said he would not comment on anyone's specific security clearance situation, but that Kushner's role in the White House would not be diminished.
Jared Kushner's family real estate business secured two bog loans after a White House meeting with bank executives.
Kushner Companies has said in a statement that Jared Kushner's White House role had no impact on the company's financial relationships.
Perhaps if Kushner weren't so politically motivated himself, he wouldn't have to worry about having his potential conflicts of interest scrutinized. $325 million last spring after CEO Michael Corbat met with Kushner in the White House, reportedly to discuss financial and trade policy.
Deutsche Bank received a grand-jury subpoena from prosecutors for information regarding that loan around the same time, according to a person familiar with the matter.
Kushner's portfolio ranges from prison reform to Middle East negotiations.
Over a period of months, Mr. Harris met regularly with Mr. Kushner and other White House officials.
This blurring of lines is a potential liability for Kushner, who recently lost his top-secret security clearance amid worries from some US officials that foreign governments might try to gain influence with the White House by doing business with Kushner. Kushner's firm has sought investments from the Chinese insurer Anbang and from the former prime minister of Qatar.
The downgrade will limit Kushner's ability to view highly classified information, though officials familiar with the move said it will not affect Kushner's ability to do a job that includes diplomatic dealings with other countries.
Kushner's company, which he left to take his position in the White House past year, is also being investigated by the U.S. Securities and Exchange Commission, along with federal prosecutors in NY, over its use of a visa program used to attract foreign investment, according to Bloomberg.
But he retained the vast majority of his interest in Kushner Cos. They are likely worth much more, because that estimate has his firm's debt subtracted from the value of his holdings.
Trump could simply grant a waiver for Kushner to receive a high-level security clearance despite the unresolved background investigation. The loan was used to refinance a Chicago skyscraper that is the Midwest headquarters for AT&T.
Citigroup, Apollo and the White House did not immediately respond to CNBC's requests for comment, which were sent outside of office hours.
Federal ethics regulations restrict government employees from participating in some matters that involve companies with which the official is seeking "a business, contractual or other financial relationship that involves other than a routine consumer transaction".