The two rhetorical techniques demonstrated in the passage are:
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Rhetorical conditional - The phrase "If the impeachment provision in the Constitution of the United States will not reach the offenses charged here" establishes a conditional statement that sets up a hypothetical scenario.
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Metaphor - The suggestion of abandoning the Constitution to a "20th-century paper shredder" is a metaphor that conveys the idea of discarding or invalidating something valuable.
Therefore, the correct answers are rhetorical conditional and metaphor.