I think it's more likely that he uses this attack as an excuse to relaunch his career in the form of a gubernatorial campaign. I didn't think he'd run at all in 2018 until the recent Senate chatter, and that doesn't change the fact that Putnam will have the money, the conservative base, some pretty solid unused research, and the backing (unofficially) of the RPOF itself plus pretty much all of the row officers and most of the non South Florida legislators.
Nah, he's not running for governor. It's another run for president in 2020 (assuming Trump loses this November) or bust. *Maybe* he also reverses himself and runs for Senate again this year. But I don't see him running for governor.