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Secretary of State Marco Rubio weighed in on the Signal debacle for the first time during a press conference in Jamaica, acknowledging that "obviously someone made a big mistake" but insisting that the overall mission was never jeopardized.

"Let me just say on the Signal thing--this thing was set up for purposes of coordinating how everyone was going to call…you know when these things happen, I need to call foreign ministers, especially of our close allies. We need to notify members of Congress. Other members of the team have different people they need to notify as well. And that was the purpose of why it was set up," Rubio said.

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Sec. of State Rubio on Signal chat: ' Someone made a big mistake'Secretary of State Marco Rubio weighed in on the Signal debacle for the first time, acknowledging that “someone made a big mistake and added a journalist.”

ABCNews.com

Rubio then spoke specifically to his contributions to the chat.

"I contributed to it twice. I identified my point of contact, which is my Chief of Staff, and then later on, I think three hours after the White House's official announcements have been made, I congratulated the members of the team," he said.

Pressed on whether the information shared was classified, Rubio pivoted to the administration's talking points on what specifically constitutes war plans.

Still, Rubio said the incident must be investigated.

"I think there'll be reforms and changes made so this never ... this was not going to happen again. It can't," he said.

-ABC News' Shannon Kingston

Prior to boarding a flight to Guam from Hawaii, Defense Secretary Pete Hegseth made his most extensive comments yet about the Signal group and the information he shared about the Houthis. He continued to deny war plans were shared in the group chat.

"Nobody's texting war plans. I noticed this morning out came something that doesn't look like war plans. And as a matter of fact, they even changed the title to attack plans, because they know it's not war plans," Hegseth said. "There's no units, no locations, no routes, no flight paths, no sources, no methods, no classified information," he said without answering any more questions.

Leavitt was asked if she could definitely say no one would lose their jobs over the Signal scandal.

"What I can say definitively is what I just spoke to the president about, and he continues to have confidence in his national security team," she responded.

Leavitt was asked numerous times about the Signal group chat and whether or not it had classified info but the exasperated press secretary refused to discuss it further./p>

The White House is continuing to assert that material included in the Signal group chat about a U.S. strike on Houthis in Yemen was not classified despite a second story published by The Atlantic on Wednesday disputing those claims.

Asked how they would characterize the discussion's contents to Americans, press secretary Karoline Leavitt said it was a "sensitive policy discussion."

"I would characterize this messaging thread as a policy discussion, a sensitive policy discussion, surely, amongst high-level Cabinet officials and senior staff," Leavitt said. She added that "the American public should decide for themselves based on the outcome of this operation and what happened in this operation."