“I am not inclined to be a supporter of Newt Gingrich’s having served under him for four years and experienced his leadership. Because I found it lacking often times,” Coburn said on Fox News Sunday. The Oklahoma senator served in the House of Representatives from 1995 to 2001.

“There’s all kind of leaders, leaders that instill confidence and leaders that are somewhat abrupt, leaders that have one standard for the people that they are leading and a different standard for themselves,” he said. “I will have difficulty supporting him for president of the United States.”

Coburn in March said that he was looking for a president that would unite the country and raised questions about Gingrich’s confrontational style.