Sen. Tom Coburn (R-Okla.) said Wednesday he would not support former House Speaker Newt Gingrich (R-Ga.) should he run for president.

Speaking on C-SPAN's “Washington Journal,” Coburn, who was among those who waged an unsuccessful coup attempt against Gingrich as Speaker in 1997, said the Georgia Republican isn't the kind of politician who could unite people as president.

"He is undoubtedly the smartest man I ever met. He is a thinker. He has a great vision," Coburn said. "The question to me is, does he have the capability to lead the country? And having served under him in the House, he's probably not one that I would choose to support in a presidential [race]."

Coburn said that he didn't think Gingrich could bring the country together.

“We need somebody that's soft and … is stable and learned and is gonna consistently bring us together rather than alienate us," Coburn continued.

Gingrich is set to make an announcement about his presidential ambitions sometime this week. It was reported that Gingrich would announce his plans to form an exploratory committee on Thursday at an event with Georgia Gov. Nathan Deal (R), but a spokesman for Gingrich denied that report Tuesday night.

Watch Coburn at around the 30:00 mark in the video below: