When the previous criminally-inclined Republican 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 carefully-crafted.
Today, sadly, MAD as a print magazine is gone (except for reprints), and the increased speed political matters now proceed at prevents such material from being created!