Conversation so far:
What was the Covode Committee?
created the Covode Committee to investigate the administration for evidence of offenses.
Was there ever any evidence found?
The committee was unable to establish grounds for impeaching Buchanan.
What year did they try to impeach him?
CANNOTANSWER.

Question: What was the reason for wanting him impeached?
Self-contained rewrite: What was the reason for wanting James Buchanan impeached?