(CNN) White House adviser Jared Kushner was rejected for a security clearance by two White House security specialists after his FBI background check raised concerns, but their supervisor overruled them and approved Kushner's top secret clearance, NBC News reported Thursday, citing two sources familiar with the matter.

CNN has not confirmed the report.

On Wednesday, Democratic Rep. Elijah Cummings, Chairman of the Committee on Oversight and Reform, launched an investigation into the White House's security clearance process.

"My request letter to the White House explicitly covers Mr. Kushner, and we expect the White House to produce all of the documents and interviews we requested to determine if tonight's breaking story is accurate," Cummings said in a statement Thursday after the NBC report.

According to NBC, Kushner's FBI background check "identified questions about his family's business, his foreign contacts, his foreign travel and meetings he had during the campaign, the sources said, declining to be more specific."

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