Cmdr. Christopher Johnson was relieved of his duties "due to a loss of confidence in his ability to command," the Navy said.
By Beth Sullivan
The Defense Inspector General's Office will look into whether the defense secretary improperly shared sensitive information on the commercial app.
Republican and Democratic leaders on the Senate Armed Services Committee are requesting a formal investigation into the Signal chat scandal.
Former U.S. defense officials said the unsecured messaging chain could have jeopardized the operation and put American lives at risk.
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