Congressional Republicans on Monday aired concerns about the Trump administration’s handling of classified material after a report showed top officials used an unauthorized messaging platform to discuss planned attacks against Houthi rebels in Yemen, calling the episode “embarrassing” and “inconceivable.”

But even as some called for investigations into the incident, leaders stopped short of demanding any action to be taken against the officials involved.

Atlantic Editor-in-Chief Jeffrey Goldberg reported Monday that national security adviser Mike Waltz had seemingly inadvertently added him to a Signal group that that included several other top-level national security officials including Defense Secretary Pete Hegseth.

The officials proceeded to lay out detailed war plans to attack the rebels ahead of the March 15 military operation.

“We’re very concerned about and we’ll be looking into it on a bipartisan basis,” Senate Armed Services Committee Chair Roger Wicker (R-Miss.) said, adding that the panel “definitely” plans to investigate the situation.

“It’s definitely a concern,” Wicker added. “It appears that mistakes were made.”

A spokesperson for the White House National Security Council confirmed the veracity of the discussions to Goldberg, who was on the thread alongside Vice President Vance, Secretary of State........

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