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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 RubioSunday shows preview: Questions linger over Trump-Putin summit Hillicon Valley: Trump's Russia moves demoralize his team | Congress drops effort to block ZTE deal | Rosenstein warns of foreign influence threat | AT&T's latest 5G plans On The Money: Trump 'ready' for tariffs on all 0B in Chinese goods | Trump digs in on Fed criticism | Lawmakers drop plans to challenge Trump ZTE deal MORE (R-Fla.), who Romney himself confirmed was under consideration, and Sen. Rob PortmanRobert (Rob) Jones PortmanGOP to White House: End summit mystery US to provide additional 0M in defensive aid to Ukraine Senate GOP attempts to wave Trump off second Putin summit MORE (R-Ohio), who told ABC News earlier this week that he had met multiple times with Romney's vetting team.