The defense secretary’s efforts to block or delay promotions to general or admiral for some officers has raised concerns that he may be targeting them because of race, gender or affiliation with the Biden administration, sources say.

Defense Secretary Pete Hegseth has taken steps to block or delay promotions for more than a dozen Black and female senior officers across all four branches of the military, some of whom are seen as having been targeted because of their race, gender or perceived affiliation with Biden administration policies or officials, according to nine U.S. officials familiar with the process.

The process within the Army, the Air Force, the Navy and the Marines is structured to ensure the most qualified officers get promoted.

Hegseth’s decision to intervene in the process has raised concerns among some officials within those military branches and the White House, the nine U.S. officials familiar with the situation said.