US National Security Advisor Mike Walz is stepping down from his position, CBS and Reuters reported.
According to the same sources, his deputy Alex Wong will also leave his position.
The White House said it would not comment on information coming from anonymous sources.
US special envoy Steve Witkoff, who has been involved in diplomacy related to the Russia-Ukraine conflict and the Middle East, is being mentioned as a possible successor to Volz, one of the sources told Reuters.
Also mentioned is Richard Grenell, Trump's envoy for special missions, who, unlike Witkoff, has previous diplomatic experience.
Grenell was ambassador to Germany during Trump's first administration, special envoy for Serbia-Kosovo negotiations and acting director of the National Intelligence Service.
This news comes weeks after Volz took responsibility for a group chat in which senior officials planned military strikes in Yemen, in the presence of a journalist who was mistakenly added to the conversation.
Walz is the first senior official to leave the administration of US President Donald Trump, which yesterday completed the first 100 days of its second term.
Volz, who served as Trump's national security adviser, was among Trump's first appointments after the election.
Before his role in the White House, Walz was a congressman from Florida's sixth congressional district from 2019 until January of this year, when he resigned to take a new position in the Trump administration.
During his term in Congress, he was a member of the committees on intelligence, armed forces, and foreign affairs.
He previously served as an officer in the United States Army and National Guard, from which he retired after 27 years of service with the rank of colonel.
Explanation of the Signal chat error
In late March, The Atlantic magazine's editor-in-chief, Jeffrey Goldberg, reported that a user named Mike Waltz had mistakenly added him to a chat on the Signal app.
The group included senior administration officials, including user accounts identified as Vice President J.D. Vance and Secretary of Defense Pete Hegseth.
Goldberg said he had access to classified military plans for US attacks on Yemen, including weapons packages, targets and the timing of the attacks – a full two hours before the bombs were dropped.
Volz initially stated that he did not know how Goldberg ended up in that chat, but in an interview with Fox News he took "full responsibility", saying that he was the one who "formed the group".
Sources told CBS News that Waltz tried to add one of the main spokespersons to the Signal Group, but mistakenly added Goldberg.
According to the same sources, investigators determined that Goldberg's number was accidentally saved in Volz's phone as an alternate contact for National Security Spokesperson Brian Hughes.
Trump eventually stated that he would "look into" this case.
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