Ellen Johnson Sirleaf is accused of encouraging people to vote against her vice-president, Joseph Boakai.
Former footballer George Weah won the presidential elections in December, defeating Mr Boakai.
Ms Sirleaf, who is a Nobel Peace Prize winner and Africa’s first elected woman president, could not stand again.
A spokesman for the governing Unity Party said Ms Sirleaf had violated the party’s constitution as she was seen campaigning with Mr Weah, who was running under the Coalition for Democratic Change banner.
Ms Sirleaf has not yet commented.
Mr Weah will be sworn in later this month. It will be the first smooth transfer of power since 1944 in Liberia, which was founded by freed US slaves in the 19th Century.
Ms Sirleaf gained popularity at home and abroad for helping to bring stability to her country after years of civil war.
A Freelance Journalist, Entrepreneur and Philanthropist. Editor-in-Chief of www.233times.com. A contributory writer for Ghanaian Chronicle Newspaper. An alumnus of Adisadel College where he read General Arts. He holds first degree in Bachelor of Arts from the University of Ghana; Political Science (major) and History (minor). He has also pursued MSc Corporate Social Responsibility (CSR) and Energy with Public Relations (PR) at the Robert Gordon University in the United Kingdom. His mentors are Rupert Murdoch, Warren Buffet, Sam Jonah, Kwaku Sakyi Addo and Piers Morganview all posts by: Nana Kwesi Coomson
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