Benson Masubo alias Chacha, who is said to have used personal details of female MPs to extort them, faced Resident Magistrate Christine Njagi on Tuesday.
Investigating officer John Kiprop had asked for a seven-day detention period noting they were yet to record statements by witnesses.
Kiprop added the suspect would likely escape if released - he was arrested on March 30 at Tarime in Tanzania while trying to escape to the Democratic Republic of Congo.
The officer further said the investigation will enable police recover exhibits that are crucial to the case.
The Magistrate ordered that the suspect be held for four days and undergo mental checks.
The suspect, whose trickery caused an uproar in Parliament after MPs sought intervention, is facing charges related to conspiracy to commit fraud.
Murang’a Woman Representative Sabina Chege complained about the issue prompting a debate in the August House.