Jared Kushner, the president’s son-in-law and adviser, used a private email account to send or receive about 100 work-related emails during the administration’s first seven months. But Mr. Kushner was not alone. Stephen K. Bannon, the former chief White House strategist, and Reince Priebus, the former chief of staff, also occasionally used private email addresses. Other advisers, including Gary D. Cohn and Stephen Miller, sent or received at least a few emails on personal accounts, officials said.

Ivanka Trump …used a private account occasionally [after] she formally became a White House adviser.

…Officials are supposed to use government emails for their official duties so their conversations are available to the public and those conducting oversight.

…The acknowledgment of private email use came as the White House is responding to a wide-ranging Justice Department request for documents and emails as part of the special counsel investigation into Russian election meddling.

…It is not clear why even sporadic use continued after a campaign in which email habits became a source of controversy. 

…The private email accounts immediately triggered questions in Congress. Representative Trey Gowdy, Republican of South Carolina, who was among those who most vociferously criticized Mrs. Clinton’s email use, sent a letter to the White House and federal agencies asking about the Trump administration’s personal email use.

Representative Elijah E. Cummings, the senior Democrat on the House Oversight and Government Reform Committee, asked the White House to make sure that none of Mr. Kushner’s emails are deleted.
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hmmmmm