You may want to keep up, goalpost-runner McGee, the unprecedented part was: "Historians, diplomats, and former White House officials of both parties have said that it was unprecedented for a U.S. president to solicit foreign interference in American elections for his own personal and political benefit. The controversy led to an impeachment inquiry against Trump."
Whether you think a prior POTUS was involved in any old "quid pro quo" dealings is besides the point unless you are talking about involving a foreign government in one of our elections.
I can do you one better: the POTUS "can" do whatever he goddamn wants, it's just a matter of if the other 2 branches of government would do anything about it (checks and balances, you know). You may want to brush up on your
core concepts of government about what Commanders-in-Chief "can" and "cannot" do. If Trump and his followers truly believe that this is a rogue government attempt to stage a coup against the presidency, surely he could justify the use of many emergency powers, no? It is for the good of the country, after all. Please, by all means, bring SCOTUS in on this too, I am sure they would agree Congress has gone rogue under Pelosi and is a danger to the Constitution.