Jared Kushner has been accused of failing to disclose emails he received about possible Russian collusion with Donald Trump's presidential election campaign team in 2016.
According to two senators, who are part of an investigation into alleged Russian involvement, Mr Kusher provided an “incomplete” disclosure of files to their committee.
Mr Kushner, who is married to Mr Trump's daughter Ivanka and is a close adviser to the President, helped run Mr Trump's digital media strategy in last year's campaign
In a letter, the senators - Senator Charles Grassley, a Republican, and Senator Diane Feinstein, a Democrat - said they knew about a string of emails that were relevant to inquiries, but were not included in the disclosure.