As I've said before, the whole conversation on this subject over the last 3+ years has been retarded.
You don't take an electoral vote certification document that has been properly signed and sealed as required under the U.S. Constitution and send it back "for verification."
That's like mailing a check in the mail to pay a bill, and the credit card company sends it back to you "just to be sure" you intended to send the payment.
Yes he could have. The Constitution does not in any place require rubber stamping.
And all of the deep state Unipartiers that claim to be conservative could have refused to certify.