<Tr> <Th> Senate political groups </Th> <Td> <Ul> <Li> Republican (51) </Li> <Li> Democratic (47) </Li> <Li> Independent (2) </Li> </Ul> </Td> </Tr> <Ul> <Li> Republican (51) </Li> <Li> Democratic (47) </Li> <Li> Independent (2) </Li> </Ul> <Li> Republican (51) </Li> <Li> Democratic (47) </Li>

What is the function of congress in the federal government