The officials said Kushner is in a different category from former Trump aides Paul Manafort and Michael Flynn, who are formally considered subjects of the investigation. Records of both Manafort and Flynn have been demanded by grand jury subpoenas, NBC News has reported.

It is not known whether Kushner has received any records requests from federal investigators.

Also unclear is what precisely about Kushner’s activities has drawn the FBI’s interest as it investigates whether Trump associates coordinated with the Russian campaign to interfere in the election. Former FBI Director Robert Mueller is now leading the probe as a special counsel.