Former sports Cabinet Secretary Rashid Echesa was on Saturday moved to Nairobi where he will be grilled by detectives from the DCI.
Echesa who is an ally of Deputy President William Ruto spent Friday night at Kakamega police cells after he was captured on video slapping an electoral official in the March 4 Matungu constituency by-election.
Officials said he had resisted being moved to Nairobi but was removed from his cells by force and escorted by at least three cars.
He told police he was not ready to be moved to Nairobi as planned prompting brief deployment of anti riot police at the station.
Police said DCI has other cases they plan to consolidate with the one of Matungu before his arraignment on Monday.
It is not the first time Echesa is being arrested and prosecuted.
He is facing other charges of fake arms deal in Nairobi.
Western regional police boss Peris Muthoni said Echesa will be processed in Nairobi.