Rubio had been thought to have lost some favor in the vice presidential vetting process, but Romney has continued to mention the freshman lawmaker on the stump and in recent interviews. Talking to CNN's Piers Morgan on Thursday night, the Republican nominee again referred to the Florida senator.

"I heard Marco RubioMarco Antonio RubioTurkey says soldier killed despite cease-fire in Syria White House staggers after tumultuous 48 hours Erdoğan got the best of Trump, experts warn MORE the other day … he said, 'You know, we were poor living in Miami. We saw all these big homes across town. My parents never said, 'Gee, why don't those people give us some of what they have?' They said instead, 'Aren't we lucky to live in a country [where] with education and hard work, we might be able to achieve that ourselves?' " Romney said.

But the nominee remains tight-lipped about his eventual pick. Asked by NBC's Brian Williams about reports he was looking for an “incredibly boring white guy," Romney joked back, “You told me you were available.”

But the candidate said he didn't have any news — other than to say the decision would come after his foreign tour.

”I can tell you I’m not going to announce it this week. While I’m overseas, I’m not gonna announce my vice presidential running mate. But when the decision is made, I’ll make that announcement. It’s not made yet. But I can’t tell you when it’s gonna be,” Romney said. “That’s something which we’ll decide down the road.”