Sakaja attended Raila's prayer event on Monday, February 10.
The alleged infighting among the powerful principal secretaries comes amid a looming reshuffle of the PSs.
The construction of the highway is set to commence this year after Kenya acquired a loan for the road.
This was one of Ruto's major campaign promises, particularly made in the region, which is yet to be fulfilled.
The three will be grilled over an incident that left scores injured including a police officer.
The Senator was critical of reports that Raila would be accompanied by 100 lawmakers to support him on Saturday.
The report noted some of the largest concerns from Kenyans over the performance of various governors.
The bandits are said to have made away with an AK-47 rifle.
The latest development seemingly goes against the grain of what the Nairobi Governor has been advocating for since assuming office.
Applicants have been urged to take advantage of the open KUCCPS portal to apply for the May intake.