In addition to Russian election meddling, the special counsel's probe is now looking into financing efforts that President Trump's son-in-law Jared Kushner undertook on behalf of his family company during the presidential transition, according to a report.
The investigation team is yet to contact Kushner Companies.
The other Kushner meeting of interest to Mueller is one that took place with a Qatari investor in an effort to secure financing for the same property, but that deal also stalled, according to CNN.
There have been reports that Mueller was already investigating Kushner's contact with Russian Federation but this is the first indication that his team is looking at Kushner's financial relationships with other countries.
However, Kushner's legal team denies the Mueller team is probing his business dealings.
The special counsel's team has not yet requested documents from the Kushner Cos. or interviews with its executives, per CNN.
Donald Trump Jr. arrives in India to help sell apartments
In the United States , some experts have pointed out the disagreement of interests during Donald Trump Jr.'s India visit. In all 254 flats of different sizes are up for sale costing almost 820,000 US dollars and above.
CNN said the reason for Mueller's interest in the topic was not clear.
During the transition, Kushner was also the lead contact for foreign contacts trying to reach his father-in-law, the president elect.
A representative for Anbang declined to comment.
Mr Kushner also met Sergey Gorkov, chairman of Russian state-run Vnesheconombank, during the transition, but he testified in congress that the meeting was only for official government purposes. In the talks, the officials say, Mr. Kushner has insisted that he maintain his current level of access, including the ability to review the daily intelligence briefing when he sees fit.
Despite the issues with his background check, Kushner has enjoyed access to some of the same classified information as Trump - much like the ousted staff secretary Rob Porter, who was shown the door earlier this month over multiple accusations of domestic abuse.
Last year, Trump said he would view any investigation of his or his family's personal finances as a "violation" by Mueller that crosses a red line. Mueller is authorized to investigate links between Trump associates and Russian Federation as well as "any matters that arose or may arise directly from the investigation".