Here are excerpts from the three articles
of impeachment against President Nixon that were approved by the House
Committee on the Judiciary in July 1974. Compare and extrapolate
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ARTICLE I, OBSTRUCTION OF JUSTICE (Approved 27-11)

In his conduct 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 violation of his constitutional duty to take care that
the laws be faithfully executed, has prevented, obstructed and impeded
the administration of justice, in that:
On June 17, 1972, and prior thereto, agents of the Committee for the
Re-election of the President:
Committed unlawful entry of the headquarters of the Democratic National
Committee in Washington, District of Columbia, for the purpose of
securing political intelligence. Subsequent thereto, Richard M. Nixon,
using the powers of his high office, engaged personally and through his
subordinates and agents in a course of conduct or plan designed to
delay, impede, and obstruct the investigation of such unlawful entry;
to cover up, conceal and protect those responsible; and to conceal the
existence and scope of other unlawful covert activities. ...
Wherefore Richard M. Nixon, by such conduct, warrants impeachment and
trial, and removal from office.
ARTICLE II, ABUSE OF POWER. (Approved 28-10)
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, impairing the due and
proper administration of justice in the conduct of lawful inquiries, of
contravening the law of governing agencies of the executive branch and
the purposes of these agencies. ...
ARTICLE III, DEFIANCE OF SUBPOENAS. (Approved 21-17)
In his conduct of the office of President of the United States, Richard
M. Nixon, contrary to his 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 violation of his constitutional duty to take care that the laws
be faithfully executed, has failed without lawful cause or excuse to
produce papers and things as directed by duly authorized subpoenas
issued by the Committee on the Judiciary of the House of
Representatives on April 11, 1974, May 15, 1974, May 30, 1974, and June
24, 1974, and willfully disobeyed such subpoenas. ...
[Full]