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US President Donald Trump's son-in-law Jared Kushner, who is also a senior adviser to the White House, is under FBI scrutiny as part of its probe into Russia's meddling in the 2016 US election, NBC News reported on Thursday.

The report citing multiple sources said Kushner's interaction with the Russians has been a focus of the investigation. In December, Kushner met with the Russian ambassador to the US Sergey Kislyak and a banker from Moscow, according to NBC.

But it remains unclear exactly what activities have drawn the FBI's attention, and investigators' interests in Kushner "does not mean they suspect him of a crime or intend to charge him," the report said.

This came after reports that Trump's former national security adviser Michael Flynn and campaign manager Paul Manafort have been examined for their connections with the Russian government.

The 36-year-old Kushner, who is married to Trump's daughter Ivanka, is an American real estate investor and worked in his father-in-law's presidential campaign team as a key adviser on US policy toward Israel and campaign strategy. In January, he was named senior adviser to the president and became a powerful figures in the West Wing.