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Elon Musk and his Department of Government Efficiency team are reviewing how The Atlantic editor was added to a Signal group chat where plans for a U.S. military attack in Yemen were discussed, a senior White House official confirmed to ABC News.

In his interview with Fox News Tuesday night, National Security Adviser Mike Waltz alluded to Musk's involvement, saying, "I just talked to Elon on the way here -- we have the best technical minds looking at how this happened."

The White House official confirmed to ABC News that DOGE is involved and that the team is working with other teams to make communications "more secure and efficient."

Additionally, White House press secretary Karoline Leavitt said on Fox News Tuesday evening that "Elon Musk's team of experts is looking at this, and the National Security Council is all digging into this matter to ensure this could never happen again."

-ABC News' Will Steakin

During an appearance on Fox News on Tuesday, National Security Adviser Mike Waltz seemed to accuse The Atlantic's Jeffrey Goldberg of somehow putting his contact incorrectly into Waltz's phone or getting into the Signal group chat in another way.

This comes after several top members of President Donald Trump's administration discussed a military operation in Yemen in a group chat that included Goldberg.

Waltz seemed to imply that it was an error with the contact on his phone, saying, "Have you ever had somebody's contact that shows their name and then you have and then you have somebody else's number..." he said when asked how Goldberg's contact was in his phone.

"You got somebody else's number on someone else's contact. So, of course, I didn't see this loser in the group. It looked like someone else. Now, whether he did it deliberately or it happened in some other technical mean, is something we're trying to figure out," Waltz added.

The Atlantic reported on Monday that the user was called "Michael Waltz" who invited Goldberg into the chat. Waltz insisted that he does not know or speak to Goldberg.

Waltz did concede that he did indeed put the chat together and bears responsibility for that.

"I take responsibility. I built the group. Okay, so, but look, that's the part that we have to figure out, and that's the part that was embarrassing, yes," Waltz said.

-ABC News' Michelle Stoddart

Elon Musk's Department of Government Efficiency updated its website Tuesday afternoon, claiming to have saved roughly $130 billion in federal money through its sweeping ongoing efforts to slash the federal government.

Notably, DOGE's total alleged "estimated savings" has gone up by $15 billion after Musk's group went two weeks without updating the total number on its website.

Musk has repeatedly said that his goal is to cut $1 trillion. So far, DOGE is at 13% of that goal, based on the group's claimed -- and unverifiable -- total savings.

DOGE's Wall of Receipts now shows more than 7,000 alleged terminated contracts, more than 9,000 alleged terminated grants and nearly 700 alleged terminated real estate leases, reflecting roughly $54 billion in savings out of the alleged total of $130 billion.

DOGE acknowledges that the Wall of Receipts reflects a portion of the total alleged savings as it continues to work on uploading all of its terminations.

Also notably, while Musk and DOGE have claimed full transparency, this week's update removed some information, deleting most of the details listed for terminated USAID contracts, except for the dollar amount, with each USAID contract's description now saying, "Unavailable for legal reason." Descriptions for USAID grants are still listed.

-ABC News' Soo Rin Kim and Will Steakin

Sen. Mark Kelly (D-AZ) is calling for accountability in the wake of the Signal group chat fiasco -- where a journalist was added to a conversation with top Trump administration officials discussing a military operation in Yemen.

Kelly joined ABC News Live after attending the heated hearing in the Senate on Tuesday, addressing the security breach.

"You have an opportunity to get into a skiff that should not be done on an unsecured messaging app. I mean, how ridiculous and dumb was that?" Kelly said.

"I think there needs to be an investigation and people should be held accountable," he added.

During the Senate hearing Tuesday, U.S. Director of National Intelligence Tulsi Gabbard and CIA Director John Ratcliffe denied there was classified information shared in the group chat.

"People know the way this is supposed to work," Kelly continued. "And this was a very big breach of the way we handle classified information, discussing military strikes on a messaging app and then not being able to answer the questions."

-ABC News' Luca Balbo