In a bipartisan letter to VA Secretary Robert Wilkie, lawmakers said they are concerned about staying up-to-date .
Department of Veterans Affairs - VA
The man, in his 70s, died Saturday at the VA Portland Healthcare System due to complications from the disease.
His case had no link to others at the Oregon Veterans Home in Lebanon.
The Department of Veterans Affairs has been criticized for not releasing a comprehensive emergency response to the disease.
The Department of Veterans Affairs has banned virtually all visitors from its nursing homes and spinal cord injury centers.
There are currently about 3.2 million veterans aged 65 years or older using VA health care services.
The report alleges that a climate of intimidation exists at the VA's Office of Accountability and Whistleblower Protection.
While other-than-honorable discharges can preclude veterans from some VA services, that's not always the case.
Federal prosecutors have said they are probing the deaths of up to 11 patients at the hospital.
Concerns over toxic exposure are not limited to Vietnam War-era veterans.