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.
The new rules allow military leaders to fire at some targets without direct approval from the White House, according to a U.S. defense official.
Many are now left stranded in Albania, Pakistan and Qatar awaiting transfer to the U.S. Others remain in hiding from the Taliban in Afghanistan.
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