LeBreton was the star of the Duffy Affair and was renowned for her stark criticism of the media. She offered little reason for her resignation after 7 and a half years at the post and thanked PM Harper for "the opportunity of a lifetime." LeBreton will stay in the Conservative caucus and will have to retire in 2015 when she hits the mandatory retirement age of 75.
"Most of all, I want to thank him for his trust, his strong leadership and his friendship," she said.
"While I will be leaving the position of government leader in the Senate, I will continue to be an active member of the Conservative caucus over the next few years," said LeBreton. "I intend to step up my efforts in support of meaningful Senate reform and also actively back the new strengthened rules we introduced regarding Senate expenses."