The United States Congress features the United States Senate.
United States Congress . The Congress meets in the Capitol in Washington , D.C. Both senators and representatives are chosen through direct election , though vacancies in the Senate may be filled by a gubernatorial appointment . Each senator is elected at-large in their state for a six-year term , with terms staggered , so every two years approximately one-third of the Senate is up for election . The United States Senate is the upper chamber of the United States Congress which , along with the United States House of Representatives , the lower chamber , composes the legislature of the United States of America .