Sen. Bob Corker (R-TN) delivered a stinging rebuke of President Trump on Thursday, telling reporters in his home state that the president has yet to show the “stability” or “competence” necessary to be a successful leader. “He also recently has not demonstrated that he understands the character of this nation,” Corker said. “He has not demonstrated that he understands what has made this nation great and what it is today. And he’s got to demonstrate the characteristics of a president who understands that.” Corker, who chairs the Senate Foreign Relations Committee, said “radical changes” are needed in the White House. Corker has not been afraid to criticize the Trump administration, and was previously in line to be chosen as secretary of state.