Portman could seek NRSC chairmanship

Sen. Rob PortmanRob PortmanEndangered GOP senator: I don't know for whom I'll vote GOP vulnerables dial back Hillary attacks Vulnerable House freshmen passed most bills in decades, analysis finds MORE (R-Ohio), one of Mitt Romney’s closest allies in the past year, is considering a bid for the chairmanship of the National Republican Senatorial Committee.

A source close to Portman said he has been receiving calls over the past few weeks asking him to run. Portman is flattered by the attention but has not made any decision, according to the source.

If Portman decides to pursue the post, it sets up a leadership race with Sen. Jerry MoranJerry MoranGOP senators avoid Trump questions on rigged election Overnight Finance: Lawmakers float criminal charges for Wells Fargo chief | Scrutiny on Trump's Cuba dealings | Ryan warns of recession if no tax reform GOP senators press Treasury to withdraw estate tax proposal MORE (R-Kan.), who has been quietly lobbying his colleagues for the job.

Senate Republican Leader Mitch McConnellMitch McConnellLiberal groups call for delaying cures bill to next year Conservative groups urge against extending energy tax breaks GOP vulnerables dial back Hillary attacks MORE (Ky.) reportedly wanted rising-star freshman Sen. Marco RubioMarco RubioThe Trail 2016: Comeback in the works? US abstains from UN resolution on Cuba embargo for first time Florida poll: Clinton leads Trump by 3 MORE (R-Fla.) to take over the NRSC, but Rubio is not interested.

A source close to Rubio said it is not likely that Rubio will make a play to succeed outgoing NRSC Chairman John CornynJohn CornynPotential Cruz challenger: 'Don't close off your options' Report: Investor visa program mainly funds wealthy areas GOP senators avoid Trump questions on rigged election MORE (R-Texas), who is running to become Senate Republican whip.