President Donald Trump’s son-in-law and adviser, Jared Kushner, is under FBI scrutiny as part of the Russia investigation, US media report.
Investigators believe Mr Kushner, 36, has significant information relevant to their inquiry, US officials told NBC News.
The FBI is looking into potential Russian meddling in the 2016 election and links with Mr Trump’s campaign.
Mr Trump denies any collusion between his campaign and Russia.
He has described the situation as “the single greatest witch hunt of a politician in American history”.
The US officials, who were not named, said that the interest in Mr Kushner did not mean the investigators suspected him of a crime or intended to charge him.
Separately, the Washington Post reported that the investigators were focusing on meetings he held with the Russian ambassador to the US, Sergei Kislyak, and a banker from Moscow.
Mr Kushner has so far made no public comments on the latest reports.
Robert Mueller, a former FBI boss, last week was named special counsel to oversee the inquiry.
Congress is also looking into potential Russia’s alleged meddling in the 2016 election and any Trump campaign ties.
Mr Kushner has already agreed to discuss his Russian contacts with the Senate Intelligence Committee.
Calls for a special investigation have mounted since President Trump fired the most recent FBI director, James Comey, earlier this month.
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