PRESIDENT DONALD TRUMP’S national security advisor and another staff member have used Gmail for official communications, the Washington Post reported Tuesday, citing documents and interviews with US officials.

The newspaper said that one of Mike Waltz’s senior aides used Gmail to discuss military positions and weapons systems, while the national security advisor himself had his schedule and other work documents sent to his account on the email service.

It is the latest example of Waltz engaging in questionable security practices, after he inadvertently added The Atlantic magazine’s editor-in-chief to a group chat last month on Signal, a commercially available messaging app, in which air strikes against Yemen’s Huthi rebels were discussed.

Officials including Waltz and Defense Secretary Pete Hegseth used the chat to talk about details of the air strike timings and intelligence, unaware that the highly sensitive information was being simultaneously read by a member of the media.

Waltz told Fox News host Laura Ingraham last week that he took “full responsibility” for the breach, saying: “I built the group; my job is to make sure everything’s coordinated.”

Trump has rejected calls to sack Waltz or Hegseth and branded the scandal a “witch hunt.”

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White House Press Secretary Karoline Leavitt meanwhile told journalists on Tuesday that “the case is closed, and the president continues to have confidence in his national security advisor.”

But the Gmail revelations could add to pressure for Waltz’s removal from office.