Moreover, the flourishing condition of the spoils system served to aggravate the antagonism between the two departments. History shows that, while selfish motives are always indignantly repudiated by politicians, they account for many of the more important political movements of the century. With the immense federal patronage at his disposal, Johnson realized that he had a powerful instrument of revenge at hand, and he did not hesitate to use it. At a time when every congressman was under the strongest pressure from his home constituency, inability to gratify the demands of the voracious office-seeker was indeed a cause for bitterness. We can thus easily distinguish three causes which, working together upon a strongly Republican Congress, resulted in the attempted removal of the President. First, the antagonism arising from different fundamental political ideas, the strained conditions of the times, and the woeful tactlessness of Johnson; second, the almost morbid yet natural fears of the Republican party regarding the sometime seceded States; third, the anger aroused by the use of federal patronage to further the interests of the President. 2. Impeachment, however, was too serious a matter for Congress to enter upon lightly. Art. II, sec. iv, of the Constitution provides for impeachment as follows: "The President, Vice-President and all civil officers of the United States shall be removed from office on impeachment for, and conviction of, treason, bribery, or other high crimes and misdemeanors." Obviously the President had not committed and would not commit anything that could legally be called treason or bribery: Had he done or would he do anything which could be construed as a high crime or misdemeanor? The answer largely depended upon the person's point of view. The extreme radical held that Johnson's whole career as President could be considered as an attempt treasonably to reinstate the Southern States in a position of power. The more moderate Republicans could not be made to acquiesce in this view, and it soon became evident that Johnson would never be brought to trial on impeachment, unless he could be made to violate some clearly defined law. The radical element, however, did not easily accept this situation. By every means possible they tried to force the moderates into line. The whole past career of the President was critically studied, and every act which could by any possible means be construed as a breach of presidential duty was put in the list of offences for which he should be tried. But all to no purpose. Something more tangible must be produced, or the trial would never occur.