Sen. Dianne Feinstein, D-Calif., called Sunday for clear rules or legislation governing the use of private email accounts by White House officials. She made the comments following revelations that members of the Trump administration, including top adviser Jared Kushner, may have used private accounts to conduct official business.

"This is an area, still, without specific definition. I think that we need legislation or we need rules that are set down that everybody in the White House, every secretary of state, every senator knows. This is kind of a non-specific area that needs to be made specific with a rule or legislation," Feinstein said Sunday on CBS's "Face the Nation."

The rules governing official use of private email servers has roiled both parties in recent years with several members of the former President Barack Obama's administration having been also found conducting official business on nongovernmental accounts.