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Republican presidential front-runner Donald Trump is worried about rival Marco Rubio.

Discussing the proposed changes to the party's debates in a Monday interview with Bloomberg Politics' With All Due Respect, Trump found a way to get in a dig at the Florida senator, saying he hoped the debate venues would be better air conditioned in the future.

Rubio “is the one that sweats the most,” Trump said at New York's Wollman ice skating rink. “He’s the youngest, but I have never seen any human being sweat like that.”

Trump repeatedly jabbed at Rubio, calling him “highly overrated.”

“I don’t think he’s going to make it,” Trump said. “I said at one point he was a lightweight and I don’t mean to be insulting, but I do describe people somehow well. I described Jeb Bush as a low energy individual and it unfortunately for him that stuck.”

Trump criticized both Rubio’s absence from Senate votes, as well as his quick rise through the ranks as weaknesses. He even challenged those who have described Rubio as handsome, saying “I don’t know. I think I’m better looking than he is.”

A request for comment from Rubio's campaign was not immediately returned.

The billionaire real estate developer took over Wollman Rink—the iconic ice skating rink in New York City’s Central Park—in 1986. At the time Trump assumed control of the blighted rink from New York City, the project was $12 million over budget with no completion date in sight. Trump finished the project two months ahead of schedule and $750,000 under budget.

Trump called the rink “an example of what can be done by private enterprises” and has used it as a symbol of what he can achieve in politics.

“It’s all the same,” Trump said when asked if he was comparing building an ice skating rink to being the commander-in-chief. “It has to do with efficiency, it has to do with common sense, it has to do with knowledge.”

The Complete Donald Trump Interview: Getting Things Done

(Adds request for comment from Rubio campaign.)