They should have Comey investigate this. As long as he is exactly as thorough and objective as he was with the Clintons, the democrats will accept that there was no intentional wrong doing and accept it.
(Ivanka probably e-mailed an official government business question about fabric softener use with softened water in the laundry. Hope the North Koreans don’t learn this secret.)
Actually Comey was found to have used a personal email address for official work.