<Tr> <Th> Term length </Th> <Td> At the pleasure of the Senate, and until another is elected or their term of office as a Senator expires </Td> </Tr> <Tr> <Th> Constituting instrument </Th> <Td> U.S. Constitution </Td> </Tr> <Tr> <Th> Inaugural holder </Th> <Td> John Langdon April 6, 1789 </Td> </Tr> <Tr> <Th> Formation </Th> <Td> March 4, 1789 </Td> </Tr>

Who is the president of the us senate today