Republican senators expressed disappointment Thursday over reports that national security adviser Mike Waltz would be stepping down from his post after he became embroiled in a controversy over inadvertently sharing sensitive information with a reporter on Signal, a commercial app.

“He did a very good job as national security adviser. It’s the prerogative of the president to decide who his team will be, but I was sorry to see that news,” Sen. Ted Cruz (R-Texas) said.

Sen. Mike Rounds (R-S.D.) said Waltz’s departure is “a pretty significant........

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