He urged the Director of Public Prosecutions Noordin Haji to ensure perpetrators of graft are brought to book.
Speaking at Nyabururu Catholic Church three months ago where the DP presided over a funds drive, Mr Onyonka vowed to support Mr Ruto’s 2022 presidential bid.
He said then, he would lead Gusii leaders in supporting the DP since he had stood with them in time of need.
“I am Ruto’s key supporter, and I do not fear saying this. We will stand with him and ensure he becomes president,” said Mr Onyonka.
In another function where the DP presided over a funds drive at Marani Catholic Church this year, Mr Onyonka pledged to support the DP.
Before 2017 General Election, the MP who was a key ODM leader, quit the Orange party to join Jubilee before decamping to Ford-Kenya. The DP has also lost key allies in the Rift Valley.
Mr Zedekiah Bundotich Kiprop, popularly known as Buzeki, a fortnight ago left the DP camp.
Mr Bundotich lost the Uasin Gishu County gubernatorial seat to Mr Jackson Mandago in a hotly-contested election in 2017.
He worked closely with the DP in the last polls and was considered to be his preferred candidate for the Uasin Gishu seat.