Nixon's issue wasn't a lack of support in the courts but in Congress[1]:

> On August 7, Nixon met in the Oval Office with Republican congressional leaders "to discuss the impeachment picture," and was told that his support in Congress had all but disappeared. They painted a gloomy picture for the president: he would face certain impeachment when the articles came up for vote in the full House, and in the Senate, there were not only enough votes to convict him, but no more than 15 or so senators were willing to vote for acquittal. That night, knowing his presidency was effectively over, Nixon finalized his decision to resign.

The contrast with how compliant the majorities in Congress are today to the whims of the White House cannot be overstated. The past decade has pretty much completely eliminated any semblance of a Republican Party that stood for anything other than the whims of Trump. Everyone either got on board or was exiled from power; the third highest member of House leadership got driven from Congress for taking a stand on the events of January 6, whereas the senator who in a debate in 2016 alleged that Trump's small hands implied a similar proportion for one of his less-visible body parts faded into the background for the next eight years and was rewarded with a prominent position in the cabinet this time around.

> https://en.wikipedia.org/wiki/Presidency_of_Richard_Nixon#Re...