The first Presidential debates occurred in 1960, when John F. Kennedy and Richard Nixon had four debates.
After that, there were no debates in 1964 (refusal of Lyndon B. Johnson); 1968 and 1972 (refusal of Richard Nixon), but when Gerald Ford was running for a full term after replacing Nixon due to his resignation in the Watergate Scandal, he agreed to debates with Jimmy Carter, and Vice Presidential debates also resumed.
Both have occurred ever since, but the quality and usefulness of debates have deteriorated, and Donald Trump did great damage to the debate concept in 2016 and 2020.
So this author and blogger feels there is no point to having debates between Trump and Joe Biden, as all they would lead to is constant interruptions and insults by Trump.
And whoever Trump chooses as his Vice Presidential running mate, clearly will be someone out to insult and ridicule Vice President Kamala Harris, so not wise for such a debate to occur.