What is Charles Sumer accusing Andrew butler of?

Charles Sumner accused Andrew Butler of supporting and promoting the institution of slavery, particularly in relation to the expansion of slavery into new territories. Sumner criticized Butler's pro-slavery stance and described him as a "harlot" for his allegiance to the South's interests, which he believed were morally corrupt. This confrontation was part of a broader debate over slavery in the United States, leading to significant tensions between pro-slavery and anti-slavery factions.