Donald Trump’s national security adviser Mike Waltz included a journalist in the Signal group chat about plans for US strikes in Yemen after he mistakenly saved his number months before under the contact of someone else he intended to add, according to three people briefed on the matter.

The mistake was one of several missteps that came to light in the White House’s internal investigation, which showed a series of compounding slips that started during the 2024 campaign and went unnoticed until Waltz created the group chat last month.

Trump briefly considered firing Waltz over the episode, more angered by the fact that Waltz had the number of Jeffrey Goldberg, the editor of the Atlantic – a magazine he despises – than the fact that the military operation discussion took place on an unclassified system like Signal.

But Trump decided against firing him in large part because he did not want the Atlantic and the news media more broadly to have the satisfaction of forcing the ouster of a top cabinet official weeks into his second term. Trump was also mollified by the findings of the internal investigation.