The only thing you need to sign Senator is a letter of resignation for not upholding your oath of office to protect and defend Americans from invading hordes.
Allow someone up to the job to replace you.
Thank you.
I suggest cards and letters wishing him well in his new private sector job. Since he, obviously, has a few screws loose, he may not understand the implications of the letters. The “in your face” arrogance of these traitors is reprehensible.