How did the radical republicans aim for reconstruction differ from president johnsons

Johnson was pro-slavery and during reconstruction he was lenient towards leaders of the confederacy. Meanwhile, Radical Republicans wanted to punish the South for the Civil War, and they wanted to keep their party in power in the government for both the North and the South. Remember for later, the civil war was driven by westward expansion and power. While slavery had a lot to do with the cause of the war, Johnson and Radical Republicans were driven by their want for power.