In the last days of the Trump administration, some U.S. officials urged outgoing Secretary of State Mike Pompeo to formally declare that the Myanmar military’s campaign against the Rohingya minority was a genocide.

Such a determination, a culmination of years of State Department investigation and legal analysis, would send a signal that the generals would not enjoy impunity for their persecution of the Muslim group since 2017, the officials hoped.

Pompeo never made that call. Less than two weeks after he left office on Jan. 20, Myanmar’s generals seized power in a coup.