Washington (CNN) In his closed interview with the staff of the Senate intelligence committee, White House senior adviser and presidential son-in-law Jared Kushner did not share the existence of his personal email account, which he has used for official business, CNN has learned.

CNN has also learned that the chair and vice chair of the committee were so unhappy that they learned about the existence of his personal email account via news reports that they wrote him a letter via his attorney Thursday instructing him to double-check that he has turned over every relevant document to the committee including those from his "'personal email account' described to the news media, as well as all other email accounts, messaging apps, or similar communications channels you may have used, or that may contain information relevant to our inquiry."

The emphasis in the letter on "all other" personal accounts not known by the committee would seem to be a reflection of the frustration the committee leaders feel with that fact that Kushner was not up-front about the existence of his personal email account and their desire for him to cover the bases of all his possible communications avenues when responding to their letter. This issue could become more serious if there emerge any emails or communications related to the investigation into Russian interference in the 2016 election that Kushner has not turned over, and whether he did so with the express purpose of concealing information from the committee.

Kushner's attorney, Abbe Lowell, told CNN, "It is perfectly normal that the committees would want to make sure that they received all pertinent records. We did review this account at the time and there were no responsive or relevant documents there. The committee was so informed when documents were produced and there is no issue here."

The Senate intelligence committee had no official comment.

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