Romney: I expect VP to have 'a vision for the country'

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But as with previous teases from the campaign, the email simply asked supporters to donate for the chance to meet with his eventual pick.

"With the convention approaching quickly, the campaign is really picking up speed," Romney wrote. "And when we're moving at this pace, I cherish any opportunity to step back and meet supporters like you."

Speculation has been mounting in recent days that the presumptive GOP nominee is poised to make his selection, with planned appearances in coming days with prospective favorites like Virginia Gov. Bob McDonnell, Sen. Marco Rubio (R-Fla.) and Sen. Rob Portman (R-Ohio).