Trump son-in-law Jared Kushner has been using the encrypted messaging service WhatsApp and his own personal email account to conduct official White House business, Rep. Elijah Cummings (D-MD) has revealed.

Politico reports that Cummings first learned about Kushner’s use of the app last December, when Kushner attorney Abbe Lowell informed him and former Rep. Trey Gowdy (R-NC) about it. Lowell said that Kushner’s use of WhatsApp for official government business was perfectly legal and added that “Kushner takes screenshots of his messages and forwards them to his White House email in order to comply with records preservation laws.”

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Cummings is now demanding that the White House hand over documents related to Kushner’s use of the app, which he has reportedly used to communicate with Saudi Crown Prince Mohammed bin Salman. The congressman may issue subpoenas forcing the White House to comply if it doesn’t hand over the Kushner-related documents by April 4th.

Lowell also told Cummings that first daughter Ivanka Trump has been conducting official business through her personal email account and has not been forwarding all messages that she receives on it to her official White House account, which Cummings suggested was “a violation of the Presidential Records Act.”