Kalonzo accused Ruto’s administration of orchestrating abductions and disappearances of Kenyans.
Wiper party leader Kalonzo Musyoka has been rallying crowds across the region, alongside opposition allies like Rigathi Gachagua and Eugene Wamalwa among others.
Ruto’s development tour of Ukambani, which began on Wednesday in Makueni County, has stirred political debate.