Charles Sumner was an American lawyer, politician, and statesman who represented Massachusetts in the United States Senate from 1851 until his death in 1874. Before and during the American Civil War, he was a leading American advocate for the abolition of slavery. He chaired the Senate Foreign Relations Committee from 1861 to 1871, until he lost the position following a dispute with President Ulysses S. Grant over the attempted annexation of Santo Domingo. After breaking with Grant, he joined the Liberal Republican Party, spending his final two years in the Senate alienated from his party. Sumner had a controversial and divisive legacy for many years after his death, but in recent decades, his historical reputation has improved in recognition of his early support for racial equality.

The United States Senate Committee on Foreign Relations is a standing committee of the U.S. Senate charged with leading foreign-policy legislation and debate in the Senate. It is generally responsible for authorizing and overseeing foreign aid programs; arms sales and training for national allies; and holding confirmation hearings for high-level positions in the Department of State. Its sister committee in the House of Representatives is the Committee on Foreign Affairs.