why does the president have power to pardon
Pardon In the United States, the pardon power for federal crimes is granted to the President of the United States under Article II, Section 2 of the United States Constitution which states that the President "shall have power to grant reprieves and pardons for offenses against the United States, except in cases of impeachment". The U.S. Supreme Court has interpreted this language to include the power to grant pardons, conditional pardons, commutations of sentence, conditional commutations of sentence, remissions of fines and forfeitures, respites, and amnesties.[27]
Tenure of Office Act (1867) The Tenure of Office Act was a United States federal law (in force from 1867 to 1887) that was intended to restrict the power of the President of the United States to remove certain office-holders without the approval of the Senate. The law was enacted on March 3, 1867, over the veto of President Andrew Johnson. It purported to deny the president the power to remove any executive officer who had been appointed by the president with the advice and consent of the Senate, unless the Senate approved the removal during the next full session of Congress. The act was significantly amended on April 5, 1869. Congress repealed the act in its entirety in 1887.[1]