<Tr> <Td_colspan="2"> Executive branch of the U.S. government Office of the Vice President </Td> </Tr> <Tr> <Th> Style </Th> <Td> Mr. Vice President (informal) The Honorable (formal) Mr. President (as President of the Senate) His Excellency (international correspondence) </Td> </Tr> <Tr> <Th> Member of </Th> <Td> Cabinet National Security Council President of the U.S. Senate </Td> </Tr> <Tr> <Th> Residence </Th> <Td> Number One Observatory Circle </Td> </Tr>

When is the vice president candidate officially chosen