Impeaching

verb

1. To hinder, impede, or prevent.
2. To bring a legal proceeding against a public official.

   "President Clinton was impeached by the House in November 1999, but since the Senate acquitted him, he was not removed from office."

3. To charge with impropriety; to discredit; to call into question.
4. To demonstrate in court that a testimony under oath contradicts another testimony from the same person, usually one taken during deposition.