Florida Sen. Marco Rubio didn't exactly give a glowing assessment Wednesday of the abilities of Republican presidential nominee Donald Trump. The one-time presidential candidate said the GOP nominee would learn on the job, according to audio of a radio interview posted by BuzzFeed

Rubio was asked by a host on WGN radio, "How concerned are you about his ability to do the job, regardless of how you feel about [Democratic nominee] Hillary [Clinton]?"

Rubio said everybody knows the differences he has with Trump, but "at this point it's gotten to a choice, and really there's only two people in the world who are going to be president, either Hillary Clinton or Donald Trump."

Rubio went on to explain how the New York City billionaire could learn how to function as president, as the president.

Rubio said in the interview:

"I view the Senate as a place that can always act as a check and balance on whoever the next president is. I also think there’s something to be said for, once you’re actually in that position, once you’re actually working at this thing, and you’re in there, and you start to have access to information that perhaps you didn’t have before, especially for someone that’s never been in politics, I think it starts to impact your views a little bit. And that’s my sense of it, as he settles into this role as the nominee and ultimately the president, access to these issues is going to begin to, in some ways, kind of shape some of the policy positions given reality versus perhaps what you might read about on a blog somewhere. So I think that’s going to be a real factor."

The Florida senator described how the U.S. knows exactly what it would get with Clinton, which he portrayed as a negative, while Trump will be shaped by the job. Following a post-Republican convention bump, Trump has taken a narrow lead in national polls. The RealClearPolitics average of polls shows him leading by 1.1 points.

Trump, to put it mildly, had an interesting Wednesday. In a press conference from his luxury golf club in Doral, Florida, he seemingly called for Russian hackers to release 30,000 emails deleted by Clinton and got into a contentious exchanged with a reporter on the issue. He also referenced the mistakes Clinton's running mate Tim Kaine made while representing New Jersey, despite the fact that Kaine is a senator in Virginia.