Kushner wore many different hats during the transition, including spearheading outreach on behalf of President Trump to "over 50 contacts with people from over 15 countries", according to a statement.
Mueller's team is probing Kushner's conversations during the presidential transition to get financing for the Kushner Companies-backed 666 Fifth Avenue office building in NY after financial setbacks, CNN said, citing people familiar with the investigation.
Special counsel Robert Mueller is reportedly expanding his investigation efforts involving Jared Kushner and his business dealings.
In addition to raising questions about Kushner's conversations with potential Chinese investors, Mueller's office has also asked about the senior adviser's contacts with a Qatari investor about the embattled property.
The New York Times had earlier reported that Kushner had lined up a deal with Wu Xiaohui - the chairman of Chinese investment company Anbang - for 666 Fifth Avenue, but the talks collapsed in March 2017.
Moscow calls United States vote meddling claims 'blabber', 'fantasies'
The senior diplomat's name has come up in the FBI and congressional investigations of possible collusion between the Trump campaign and Russian Federation .
The special counsel's team has not yet contacted Kushner Companies about the matter, CNN reported. Kushner said the meeting was official government business, but the Russian banks claims Gorkov met him because he ran Kushner Companies.
Kushner Companies was nearing a deal for Anbang to invest in the 666 Fifth Avenue building when Kushner sat down with Xiaohui a week after Trump's election.
CNN said Mueller's investigators have yet to contact Kushner Companies or request interviews with its executives, and the reasons behind the focus on the outreach to foreign investors are unclear.
The property reportedly shoulders $1.4 billion in debt.
In addition to Russian election meddling and foreign financing, Mueller is looking into possible collusion between Trump's campaign and the Russian government.