Mike Waltz has been in the spotlight since he created a group chat on the messaging app Signal to discuss sensitive information about a US strike on Houthi rebels in Yemen, and accidentally invited a journalist to join it.

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.

US National Security Advisor Mike Waltz, who has faced calls to resign over his role in the recent Yemen chat group scandal, saw renewed scrutiny Tuesday after the Washington Post reported on his usage of Gmail for official work.