The Constitution sets specific grounds for impeachment. They are “treason, bribery, and other high crimes and misdemeanors.” To be impeached and removed from office, the House and Senate must find that the official committed one of these acts.
The Constitution defines treason in Article 3, Section 3, Clause 1:
Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort. No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court.
The Constitution does not define bribery. It is a crime that has long existed in English and American common law. It takes place when a person gives an official money or gifts to influence the official’s behavior in office. For example, if defendant Smith pays federal Judge Jones $10,000 to find Smith not guilty, the crime of bribery has occurred.
...
The convention adopted “high crimes and misdemeanors” with little discussion. Most of the framers knew the phrase well. Since 1386, the English parliament had used “high crimes and misdemeanors” as one of the grounds to impeach officials of the crown. Officials accused of “high crimes and misdemeanors” were accused of offenses as varied as misappropriating government funds, appointing unfit subordinates, not prosecuting cases, not spending money allocated by Parliament, promoting themselves ahead of more deserving candidates, threatening a grand jury, disobeying an order from Parliament, arresting a man to keep him from running for Parliament, losing a ship by neglecting to moor it, helping “suppress petitions to the King to call a Parliament,” granting warrants without cause, and bribery. Some of these charges were crimes. Others were not. The one common denominator in all these accusations was that the official had somehow abused the power of his office and was unfit to serve.
