(CNN) - Mitt Romney has repeatedly declined to answer questions about his vice presidential selection process, but he raised the subject in an e-mail Saturday to supporters.
"Sometime soon, I will be choosing a vice presidential candidate to join our winning ticket," he wrote.
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The e-mail from the candidate follows a similar one from his campaign manager, Matt Rhoades, on Thursday which invited supporters to donate to his campaign and enter themselves for a chance to meet Romney and his choice for No. 2.
"I would like the chance to personally introduce my running mate to you," Romney wrote in the e-mail.
The e-mail offered no indication of who he may pick.
"There are many incredible men and women who I would be lucky to have as a running mate," he wrote. "And that's why I'm so excited to invite you to meet him or her on the campaign trail with me."
The message, however, may offer a suggestion as to when Romney's decision could come.
Rhoades wrote in his Thursday email, "Every week until the VP announcement is made, one lucky supporter will win the chance to meet Mitt and his choice for VP."
But the candidate's Saturday e-mail requested donations and entries "before tomorrow at midnight" and made no mention of the contest continuing in future weeks.
There has been some speculation that Romney would announce his choice prior to his international trip later this month.
Romney was at his home in Wolfeboro, New Hampshire, on Saturday and his campaign announced no public events for the day.