Why did Johnson veto the first reconstruction act?

President Andrew Johnson vetoed the first Reconstruction Act in 1867 primarily because he believed it violated the Constitution and encroached on the powers of the executive branch. He opposed the idea of military governance in the Southern states and argued that it undermined the rights of states to self-govern. Johnson favored a more lenient approach to Reconstruction, aiming to restore the Southern states to the Union quickly without stringent federal oversight. His veto reflected his ongoing conflict with Congress, which sought to impose stricter conditions on the reintegration of the South.