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Watergate was breaking and entering and this is a coup.
I'd say this is more the highest profile investigation since Johnson, who betrayed his country to the Confederates.
"WASHINGTON — 
The highest-profile congressional investigation since Watergate concluded Thursday that former President Trump intentionally spread false claims about the 2020 election and provoked a mob of his supporters to attack the U.S. Capitol." >

I feel like it's an understatement - in my view, this is the highest-profile congressional investigation including Watergate.