Senior members of the Trump administration’s National Security Council — including its top national security adviser, Michael Waltz — used Gmail to conduct government business, The Washington Post reported, citing documents and three unnamed government officials.

Mike Waltz, who faced calls to resign over the Signal chat scandal, has sparked new scrutiny with his reported use of Gmail for official work.

National Security Adviser Michael Waltz is under scrutiny for using his personal Gmail account to discuss government matters, including military positions and weapons systems. The revelations follow an earlier controversy in which he inadvertently invited a journalist to a Signal chat about a planned military strike.