<Tr> <Th> Poll source </Th> <Th> Sample size </Th> <Th> Date (s) </Th> <Th> Margin of error </Th> <Td> Donald Trump </Td> <Td> John Delaney </Td> <Td> Undecided </Td> </Tr> <Tr> <Td> Public Policy Polling </Td> <Td> 887 </Td> <Td> August 18--21, 2017 </Td> <Td> ± 3.3% </Td> <Td> 38% </Td> <Td> 38% </Td> <Td> 24% </Td> </Tr> <Dl> <Dt> Trump vs. Franken </Dt> </Dl> <Dt> Trump vs. Franken </Dt>

When will we know who is running in 2020