On Thursday, President Joe Biden said investigators were closing in on the source of the leak of highly classified U.S. intelligence documents, in what is believed to be the most serious security breach in a decade.
The Department of Justice (DOJ) opened a formal criminal probe last week after the matter was referred by the Pentagon, which is assessing the damage done by the release.
Some of the most sensitive leaked details are purportedly related to Ukraine's military capabilities and shortcomings, and information about U.S. allies including Israel, South Korea and Turkey.
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