Identify the president who supported the plan of Radical Reconstruction.?

The president who supported the plan of Radical Reconstruction was Andrew Johnson. After Abraham Lincoln's assassination, Johnson, who became president in 1865, initially favored a lenient approach to Reconstruction, but he faced significant opposition from Radical Republicans in Congress who sought more stringent measures to ensure civil rights and a complete reorganization of Southern society. Ultimately, Johnson's resistance to their policies led to his impeachment.