A U.S. airman stationed in Niger has accused senior U.S. officials of intentionally suppressing information regarding the frayed relationship between Washington and the military junta that overthrew Niger’s democratically elected government last year.

The airman outlined his concerns with U.S. Ambassador to Niger Kathleen FitzGibbon and senior defense attache Col. Nora Nelson-Richter in a private whistleblower complaint to Rep. Dusty Johnson (R-SD) and other lawmakers.