Sen. David Vitter, R-La., said today that former Environmental Protection Agency administrator Lisa Jackson used her “Richard Windsor” alias email account to pose as her own assistant when dealing with outside groups, adding that she also used the account to correspond with White House officials.

“EPA has shown an absolute disregard for transparency with their email practices, but this one is pretty bizarre,” Vitter said in a statement today. Vitter’s office released an email exchange between Jackson and Michael Martin, conducted from her Windsor email account, in which Martin clearly believes he’s dealing with an assistant named Richard Windsor, rather than the EPA chief herself.