Donald Trump's National Security Advisor, Mike Waltz, has been using his personal Gmail account for government communications, The Washington Post reports.

Waltz, who has recently taken responsibility for accidentally adding a high profile journalist to a Signal group chat discussing sensitive military attack plans in Yemen, shared his schedule and other work documents on Gmail, sources told the Post.

A Waltz staffer also reportedly shared sensitive military data on the email service, including discussions about military positions and weapons systems being deployed in current conflicts, according to records reviewed by the paper.