When the previous criminal Repug Prez was about to be impeached in 1974...
...it was (unlike now) for a non-violent crime and MAD Magazine was at a creative peak, as demonstrated by this classic (and pretty comprehensive) piece by writer Frank Jacobs published in EC's MAD #170 (1974)!
The process took several months, allowing for such satirical pieces to be produced.
Today, sadly, MAD is gone, and the increased speed political matters are now proceeding at prevents such material from being created.