Tricky Dick was notoriously paranoid, so I wouldn't be surprised if he thought his mailman was out to get him. POTUS' state of mind isn't my point.
Watergate had a burglary, which is a crime. This Russia investigation has allegations of collusion which is not a crime. Unless someone can produce the exact statute that was violated or do we need to wait another year and a half for that?
Evidence that Donald Trump was complicit in both please.