(Kushner was reportedly first interviewed by the special counsel's team last November.) But, the attorney told The Times, Kushner's security clearance was not delayed by the special counsel's investigation.
"His application (for security clearance renewal) was properly submitted, reviewed by career officials, and went through the normal process", Kushner's lawyer, Abbe Lowell, said in a statement.
In other Mueller-related developments on Wednesday, the special counsel asked a federal judge to start the process of sentencing former Trump campaign adviser George Papadopoulos.
"In each occasion, he answered all questions asked and did whatever he could to expedite the conclusion of all the investigations".
The first interview occurred last fall and the questions were limited to former White House national security adviser Michael Flynn, who subsequently pleaded guilty to lying to the Federal Bureau of Investigation and began cooperating with Mueller.
Moreover, Lowell claimed that his client has cooperated fully with Robert Mueller's investigators, having been interviewed twice for several hours by his team. Then, in June, Kushner filed a third addendum acknowledging a meeting he had in June 2016 at Trump Tower with a Russian lawyer offering damaging information on Hillary Clinton.
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Lowell said Kushner was a witness of interest to Mueller because he had a unique vantage point on all those issues: "He was the point of contact for foreign officials in the campaign and in the transition, and he was around the circumstances in the firing of Comey".
The shake-up was a part of a White House overhaul of security clearance procedures brought on by the controversy over Rob Porter, the former White House staff secretary who was operating on a temporary security clearance despite accusations of domestic violence.
Jared Kushner has been granted permanent security clearance, renewing his access to sensitive intelligence and potentially paving the way for his return to a more active role in the White House.
The renewed access to top-secret intelligence comes three months after Kushner's level of security clearance was downgraded from "top secret" to merely "secret".
White House senior adviser Jared Kushner speaks onstage during the opening of the U.S. Embassy in Jerusalem, on May 14. And Mr. Trump, who once considered Mr. Kushner a trusted adviser, continues to tell friends he wishes that Mr. Kushner and Ms. Trump would return to NY, although Mr. Trump has not voiced this view to his daughter and Mr. Kushner in several months.