*sigh*
Evidently you're having another of your frequent senior moments. Here, allow me:
http://graphics8.nytimes.com/images/section/learning/general/onthisday/big/1020_big.gif
The story that infuriated the public and Congress, and which made both parties begin discussing impeachment the following day. You'll notice the IRS isn't mentioned.
Articles of Impeachment:
ARTICLES OF IMPEACHMENT EXHIBITED BY THE HOUSE OF REPRESENTATIVES OF THE UNITED STATES OF AMERICA IN THE NAME OF ITSELF AND OF ALL OF THE PEOPLE OF THE UNITED STATES OF AMERICA, AGAINST RICHARD M. NIXON, PRESIDENT OF THE UNITED STATES OF AMERICA, IN MAINTENANCE AND SUPPORT OF ITS IMPEACHMENT AGAINST HIM FOR HIGH CRIMES AND MISDEMEANOURS.
Article 2: Abuse of Power.
Using the powers of the office of President of the United States, Richard M. Nixon, in violation of his constitutional oath faithfully to execute the office of President of the United States and, to the best of his ability, preserve, protect, and defend the Constitution of the United States, and in disregard of his constitutional duty to take care that the laws be faithfully executed, has repeatedly engaged in conduct violating the constitutional rights of citizens, imparting the due and proper administration of justice and the conduct of lawful inquiries, or contravening the laws governing agencies of the executive branch and the purposes of these agencies.
This conduct has included one or more of the following:
(1) He has, acting personally and through his subordinated and agents, endeavored to obtain from the Internal Revenue Service, in violation of the constitutional rights of citizens, confidential information contained in income tax returns for purposes not authorized by law, and to cause, in violation of the constitutional rights of citizens, income tax audits or other income tax investigation to be initiated or conducted in a discriminatory manner.
(there are 4 more but they don't involve the IRS)
(Approved 28-10 by the House Judiciary Committee on Monday, July 29, 1974.)