New impeachment resources

We have two new resources about presidential impeachment law. The Library of Congress's Constitution Annotated has updated their section on Impeachment, with readable explanations of the Constitutional provisions, their historical background, and what offenses have been considered to be impeachable over time. Also, Hein Online has added a new U.S. Presidential Impeachment Library, with all primary documents--hearings, committee reports, articles of impeachment, special prosecutor reports--dealing with the impeachments of Presidents Andrew Johnson, Richard Nixon, William Jefferson Clinton, and Donald Trump.