Rubio vs. Walker: Why a Senator Thinks Governors Might Not Be Good Presidents

Rubio ribs the Wisconsin Governor: "If I was a governor I'd say the same thing."

But at a conservative forum moderated by ABC News’ Jonathan Karl, one senator with possible presidential ambitions made a strong case for senatorial leadership:

“I do think having experience but also a seriousness about the breadth and scope of the challenges we face which are much more difficult than they were 25 years ago” is important for a potential president, he said.

This isn’t the first time Rubio, a member of the Senate Foreign Relations Committee, has touted his foreign policy experience – but as ABC's Karl pointed out, his potential 2016 rivals remain unconvinced.

“I think both the presidential and the vice presidential nominee should either be a former or current governor, people who have done successful things in their states, who have taken on big reforms, who are ready to move America forward,” Walker told Karl.

“Well, if I was a governor I'd say the same thing,” Rubio said Sunday night, as laughter rippled through the audience.

“I think it would be a mistake to elect as president the architect of the Obama foreign policy,” he said. “That would be a terrible mistake.”