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He did win reelection for his current seat, so he could conceivably about-face on the resignation and still stay in office as-of the first of the year.

That, however, is not likely; whether due to the previous round of investigations starting to come to light, or due to new information that may come out. That nomination to AG was just the right nudge to make him flinch at the last minute before those documents were to be released last week. Resign so that that investigation would be dropped, and as a result he'd be backed into the corner, politically speaking. Dems don't (never did, never will) like him, and his own Republican 'teammates' get to see him for what he is.

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