They did not like his reconstruction plan
Johnson and the Radicals came into conflict because the Radical Republicans wanted a different reconstruction plan then Johnson did.
Radical Republicans wanted equal rights for freedmen (freed black slaves), and they also wanted a tougher stance against the South.
Lincoln believed in forgiveness for the south, while the radicals wanted to punish them. While Lincoln only wanted 10 percent voters to pledge loyalty for a state to rejoin the union, the radicals wanted it to be 50. the radicals also didn't want to give any rights to the blacks.
they both wanted quick reconstruction.
Lincoln wanted a soft Reconstruction
During the Presidential Reconstruction, President Lincoln wanted to be kind to the South and help them rebuild as much as possible. The Congressional Reconstruction wanted the South to pay for their rebellions.
prevent confederate leaders from returning to power after the war. the wanted the republican party to become powerful in the South.
Republicans
Radicals have existed since the beginning of time. Again and again, there have been significant groups of people who have wanted to overthrow the existing authorities.
Conservatives wanted to continue to support the kings who had ruled these lands for many centuries; Liberals wanted to give more power to elected legislatures; Radicals wanted the end of rule by kings and full voting rights for all people.
Radical Republicans