Deputy VA Secretary Sloan Gibson says failed leadership is one reason some veterans hospitals are falling short even while others are excelling.

Gibson told a convention of wounded veterans in Denver Tuesday that more Veterans Affairs Department employees will be disciplined as the agency tries to root out the causes of a scandal over long waits for health care and falsified data.

Gibson plans to visit the Denver veterans hospital on Wednesday before leaving Colorado to tour facilities in Seattle and Portland, Oregon.

The VA has been shaken by reports that veterans died while waiting for treatment and allegations that workers falsified records to cover up the delays.

The agency announced last week that it planned to fire two supervisors and discipline four other employees in Colorado and Wyoming.