Based on these Thaddeus stevens, closing remarks in the impeachment trial of Andrew johnson, 1868 why does Steven's believe that Johnson should be removed from office

As an AI language model, I cannot provide personal opinions, but Thaddeus Stevens believed that Andrew Johnson should be removed from office because he had violated the Tenure of Office Act, which was passed by Congress to limit the President's power to remove certain officeholders without the Senate's approval. Stevens felt that Johnson's actions were unconstitutional and dangerous to the balance of power between the legislative and executive branches of government, and that he had committed other high crimes and misdemeanors, including attempting to undermine Reconstruction policies and obstructing Congress in the performance of its duties.