<Table> <Tr> <Th_colspan="2"> Madam Secretary (season 4) </Th> </Tr> <Tr> <Th> Country of origin </Th> <Td> United States </Td> </Tr> <Tr> <Th> No. of episodes </Th> <Td> 22 </Td> </Tr> <Tr> <Th_colspan="2"> Release </Th> </Tr> <Tr> <Th> Original network </Th> <Td> CBS </Td> </Tr> <Tr> <Th> Original release </Th> <Td> October 8, 2017 (2017 - 10 - 08)--May 20, 2018 (2018 - 05 - 20) </Td> </Tr> <Tr> <Th_colspan="2"> Season chronology </Th> </Tr> <Tr> <Td_colspan="2"> ← Previous Season 3 </Td> </Tr> <Tr> <Td_colspan="2"> List of Madam Secretary episodes </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Madam Secretary (season 4) </Th> </Tr>

How many episodes of season 4 of madam secretary