Manuel Balce Ceneta/AP Photo

Republican Senator Tom Coburn R-Okla. has some harsh words for his former boss Newt Gingrich who is currently the frontrunner in the 2012 GOP bid for the White House.

“There’s a lot of candidates out there I’m not inclined to be a supporter of Newt Gingrich’s having served under him for four years and personally experiences his leadership,” said Coburn said today on “Fox News Sunday.”

Coburn served under then Speaker Gingrich after being elected to the House of Representatives in 1994 as part of the great Republican revival brought on by Gingrich.

“There’s all types of leaders.  Leaders that instill confidence, leaders that are somewhat abrupt and brisk.  Leaders that have one standard for the people that they’re leading and a different standard for themselves.  I just found his leadership lacking,” Coburn said.

This isn’t the first time that Coburn has spoken critically of Gingrich’s leadership style.

Coburn described the former speaker as someone who is brilliant but divisive while speaking on C-SPAN in March.

“We need someone who’s eye is critical but is not harsh in their manner,” he said.

Coburn has previously announced his decision not to run for re-election in 2016.