The arrest comes amid a power struggle between President Bingu Wa Mutharika and his predecessor, Bakili Muluzi. The UDF has been spearheading a drive to impeach Mr. Mutharika. But political observers believe Vice President Chilumpha came under investigation because he criticized the government for arresting the former speaker of parliament, Sam Mpasu, and lawmaker Maxwell Milanzi.
Boniface Dulani is a political analyst at the University of Malawi. From the capital Lilongwe, he talks with reporter Peter Clottey about the tense political situation.