The United States Congress was the legislative branch of the United States of America government. The branch consisted of a Senate and a House of Representatives. Sanctioned by the United States Constitution, this body was responsible for the authorization of spending bills, among other things.
Davy Crockett was an ex-Congressman when he fought and died at the Battle of the Alamo. (DS9: "Once More Unto the Breach")
In 1941, President Franklin Roosevelt pressured Congress for the authorization of funds for aid to the British in its war with Adolf Hitler. (TNG: "The Big Goodbye")
On May 25 1961, President John F. Kennedy, with the Vice President, Lyndon B. Johnson and the Speaker of the House, Sam Rayburn (its highest-ranking member) seated behind him, gave a famous speech to Congress in which he declared his intention that the United States would place a man on the Moon by the end of the 1960s; a photograph of Kennedy taken during the speech was scanned by the Talosians as they reviewed the library computer files on board USS Enterprise in 2254. (TOS-R: "The Cage"; PIC: "Two of One")
In December 2000, Congress and the White House joined forces to seek budget deficit cuts. (VOY: "11:59")