Economist David Ndii will be interrogated at the DCI headquarters, Kiambu Road this morning.
The NASA strategist was arrested by detectives at a beach resort in Kwale on Sunday before being moved to Nairobi overnight.
He will record statements with officers from the Serious Crimes Unit over allegations of incitement.
It is alleged that Ndii had been meeting several groups of people at the luxurious Leopard Beach resort in Diani over secession.
The economist has also publicly announced the swearing in of NASA leader Raila Odinga.
“It is true that we have him. He will record a statement with us,” a source at DCI headquarters said on Monday.