<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2010) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2010) (Learn how and when to remove this template message) </Td> </Tr> <Table> <Tr> <Th_colspan="2"> Senate </Th> </Tr> <Tr> <Td_colspan="2"> 8th National Assembly </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th_colspan="2"> Type </Th> </Tr> <Tr> <Th> Type </Th> <Td> Upper house of the National Assembly of Nigeria </Td> </Tr> <Tr> <Th_colspan="2"> Leadership </Th> </Tr> <Tr> <Th> President of the Senate </Th> <Td> Bukola Saraki, PDP Since June 9, 2015 </Td> </Tr> <Tr> <Th> Deputy President of the Senate </Th> <Td> Ike Ekweremadu, PDP Since June 9, 2015 </Td> </Tr> <Tr> <Th_colspan="2"> Structure </Th> </Tr> <Tr> <Th> Seats </Th> <Td> 109 </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Political groups </Th> <Td> <Ul> <Li> All Progressives Congress (Nigeria) (53) #006903 </Li> <Li> People's Democratic Party (50 </Li> <Li> Others (4) </Li> <Li> Vacant (2) </Li> </Ul> </Td> </Tr> <Tr> <Th> Length of term </Th> <Td> 4 years </Td> </Tr> <Tr> <Th_colspan="2"> Elections </Th> </Tr> <Tr> <Th> Voting system </Th> <Td> Multi-member plurality system </Td> </Tr> <Tr> <Th> Last election </Th> <Td> 29 March 2015 </Td> </Tr> <Tr> <Th_colspan="2"> Meeting place </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> Abuja </Td> </Tr> <Tr> <Th_colspan="2"> Website </Th> </Tr> <Tr> <Td_colspan="2"> http://www.nass.gov.ng/ </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Senate </Th> </Tr>

Which party has the highest number of senators in nigeria