Congress can not indict or convict a someone with of a crime. Just because they are investigating a crime doesn't make it a criminal proceeding.
If Nixon was actually impeached and convicted, he still wouldn't have a criminal record until the DOJ indicted him and he either plead guilty or was found guilty by a trial.
Like the FBI, they can recommend someone get indicted. But they can't actually charge anyone with a crime.
Thanks Captain Obvious. The point is it was based on criminal activity of which Nixon was involved in, which was of primary relevance to their oversight ability.
Wow, you just got proven wrong and then you called the person who proved you wrong "Captain Obvious."
The Nixon impeachment was based upon the criminal Watergate incident, so yes, it was a criminal proceeding.
Wrong. An impeachment isn't a criminal proceeding. You were wrong, now admit it.