PB, found it interesting your bringing up Nixon's Watergate and what you called the Democrats playing politics against Trump. This brings to my mind some of the differences between the Watergate era and the Democrats of today constantly investigating Trump.
For starters, Nixon, unlike Trump, had highly respected Republican members of Congress such as Senator Howard Baker willing to pursue investigations. Given this, Nixon couldn't argue the investigations were just purely partisan political witch hunts.
Just as important, citizens faithful to the GOP and Trump stand behind Trump's arguments. After Nixon's "Saturday Night Massacre" an NBC News poll showed that 75% of the public disapproved of his actions. There is no way in America today with our staunchly divided politics 75% of the people would turn against Trump.
Personally, I don't see members of Congress, given differing parties, opinions, and political ambitions, ultimately coming together on much of anything. This wasn't the case back in the days of Watergate,
With the internet (and the Russian bots) churning out disinformation as we have today, I dont think we will ever see 75% agreement on anything ever again.