<Tr> <Td> Suffolk University / USA Today </Td> <Td> February 20--24, 2018 </Td> <Td> 38% </Td> <Td> 60% </Td> <Td> 3% </Td> <Td> - 22% </Td> <Td> 1000! 1,000 </Td> <Td> Registered voters </Td> </Tr> <Tr> <Td> Public Policy Polling </Td> <Td> February 9--11, 2018 </Td> <Td> 44% </Td> <Td> 50% </Td> <Td> 6% </Td> <Td> - 6% </Td> <Td> 0687! 687 </Td> <Td> Registered voters </Td> </Tr> <Tr> <Td> Public Religion Research Institute </Td> <Td> October 18--30, 2017 </Td> <Td> 41% </Td> <Td> 54% </Td> <Td> 5% </Td> <Td> - 13% </Td> <Td> 2019! 2,019 </Td> <Td> All adults </Td> </Tr> <Tr> <Td> Washington Post / University of Maryland </Td> <Td> September 27--October 5, 2017 </Td> <Td> 37% </Td> <Td> 63% </Td> <Td> 1% </Td> <Td> - 26% </Td> <Td> 1663! 1,663 </Td> <Td> All adults </Td> </Tr>

When is the president's approval rating the highest