High crimes and misdemeanors
High crimes and dismeanors: "Bribery, perjury, and treason are among the least ambiguous reasons meriting impeachment, but the ocean of wrongdoing encompassed by the Constitution's stipulation of 'high crimes and misdemeanors' is vast.
"Abuse of power and serious misconduct in office fit this category, but one act that is definitely not grounds for impeachment is partisan discord. Several impeachment cases have confused political animosity with genuine crimes. Since Congress, the vortex of partisanship, is responsible for indicting, trying, and convicting public officials, it is necessary for the legislative branch to temporarily cast aside its factional nature and adopt a judicial role."
Source: "A Short History of Impeachment" by Borgna Brunner, Infoplease, accessed May 28, 2004.