The U.S. Army general who was selected to serve as the commander of U.S. Army Europe mistreated a congressional staffer, according to a report.

The Army is investigating Maj. Gen. Ryan Gonsalves’ misconduct, according to Stars and Stripes. He is currently serving as a “special assistant to the commanding general, III Corps.”

“General Gonsalves was substantiated for a failure to treat a Congressional staffer with dignity and respect,” the Army said in a statement. “That finding is currently under review to determine what, if any, further action will be taken.”

Gonsalves was nominated for a third star in July, and was expected to take over U.S. Army Europe in September, according to Inside Defense. But Gonsalves’ nomination stalled as the investigation into his mistreatment of the congressional staffer continues.

The general previously led the 4th Infantry Division out of Fort Carson, Colo.

The Army did not provide additional details into the exactly how Gonsalves mistreated the congressional staffer.