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In fact, during a town hall event in Colorado earlier this week, a supporter asked Romney if he'd be making his choice "before or after" the convention.

"Yes," Romney quipped, drawing laughs from the crowd.

But Romney provided little insight beyond that, telling supporters at the Colorado event he couldn't provide more of a timeline on his vice presidential selection.

Instead, the Republican hopeful simply pledged that "the person I choose you will look at and say 'that person could be president if necessary.'" But who that person could be remains the subject of intense speculation.

Among the possibilities: Sen. Marco RubioMarco Antonio RubioOvernight Defense: Tillerson, Trump deny report of rift | Tillerson says he never considered resigning | Trump expresses 'total confidence' in secretary | Rubio asks Army to kick out West Point grad Rubio asks Army to kick out West Point grad with pro-communist posts GOP establishment doubts Bannon’s primary powers MORE (R-Fla.), who Romney himself confirmed was under consideration, and Sen. Rob PortmanRobert (Rob) Jones PortmanOvernight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open Reddit hires first lobbyists Senate panel approves bill compelling researchers to ‘hack’ DHS MORE (R-Ohio), who told ABC News earlier this week that he had met multiple times with Romney's vetting team.