London: A committee of Congress has called on the White House to provide details of any aides who have used private emails for official business, reports BBC.

The investigation comes after Donald Trump's son-in-law Jared Kushner admitted doing so, and the New York Times reported that five other aides also used private email accounts.

Mr Kushner, a senior adviser, has been asked to preserve all his emails.

Mr Trump's daughter Ivanka, also uses a private account, Newsweek reported.

The New York Times has named the four other staffers implicated as Steve Bannon, the former chief White House strategist; Reince Priebus, the former chief of staff; and advisers Gary D Cohn and Stephen Miller.

Meanwhile, Newsweek magazine says it has details of an email Ivanka Trump sent about collaboration with a business organisation, copying in two federal officials.

The House Committee on Oversight and Government Reform, which has a responsibility for monitoring the effectiveness and accountability of federal government, has sent a letter to the White House demanding more information.

The letter was signed jointly by Republican Trey Gowdy, who chairs the committee, and Democrat Elija Cummings, the second most senior member.

Addressed to White House Counsel Donald McGahn, it says: "Have you or any non-career official at the White House ever used a personal email account to conduct official business?

"If so, please identify the individual and the account used, and provide evidence of measures to ensure compliance with federal law."