The president of the Brookings Institution resigned Sunday amid a federal investigation into whether he illegally lobbied on behalf of the wealthy Persian Gulf nation of Qatar.
Retired Gen. John Allen wrote in a letter to the think tank that he was leaving with a “heavy heart” but did not offer a direct explanation.
“I know it is best for all concerned in this moment,” Allen’s letter said.
A retired four-star Marine general who led U.S.
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