Army veteran Paul Lawrence will serve as the second-ranking leader at the Department of Veterans Affairs.
Former U.S. defense officials said the unsecured messaging chain could have jeopardized the operation and put American lives at risk.
For some U.S. allies, the leaked group chat about a planned Yemen attack casts doubt on intelligence-sharing with Washington.
A federal judge in New Jersey has issued a temporary ban on the removal of two transgender men from the Air Force.
