6th U.S. Senate

32 Seats

19 Federalists, 13 Republicans (Prior to the switch of March 1799)

23 Federalists, 9 Republicans (After the switch of March 1799)

Senate Majority Leader: Robert Westgate

Senate Majority Whip: Isaac Jonkers

Senate Minority Leader: John Cook

Senate Minority Whip (Before March 23, 1799): George Frier

Senate Minority Whip (After March 23, 1799): John Ramsay * Witham, Gilliespie, Frier, and Sitton leave the Republican party and switch to the Federalist party after disagreements with the establishment on the war with France