Donald Trump has been asking for it. He’s been needling, ridiculing and criticizing his immediate presidential predecessor since the moment he won the 2016 election.

Now he’s getting a portion of what he has dished out. He doesn’t like it. He called former President Barack Obama a “grossly incompetent president.” Indeed, Trump’s response to Obama’s chiding tells me plenty about the fundamental differences between these two individuals.

One of them is urbane, erudite, sophisticated. He speaks with high-minded nobility, such as what we heard Saturday night during his “virtual” commencement remarks to the nation’s high school class of 2020.

The other one is, well, crude, petulant, petty. He resorts to name-calling. He deals in innuendo, defamation of character. We have heard that, too, and we’re going to hear a lot more of it from this fellow.

Barack Obama and Donald Trump just might go at each other’s throats before this election season winds down.

But wait! Only one of these guys is running for public office in 2020. It’s Trump! He’s got an opponent out there and it’s not Barack Obama! It’s the guy who served nobly for two terms as vice president of the United States during the Obama administration.

Joe Biden has been holed up in his Wilmington, Del., basement during the coronavirus pandemic. Meanwhile, the former president has endorsed Biden’s presidential candidacy and has made it abundantly clear he intends to work hard to ensure his election this November.

Biden and Obama, though, have a difficult dance to perform. Biden will emerge in due course — and I hope it’s soon — as the Democratic Party’s titular leader. He slogged and slugged his way through a grueling primary process against a record number of primary opponents. Biden stands alone as Donald Trump’s most pressing immediate political threat.

However, Barack Obama’s standing as the nation’s most engaging political figure threatens to eclipse the former vice president. None of this, of course, doesn’t matter one damn bit to Donald Trump, who’ll continue his insufferable tirades against the former president.

Through it all, we just might be able to take a full measure of the smallness of the individual who wants a second term as president of the United States. If Barack Obama can reveal more of that to us through his measured, dignified commentary on the quality of our current leadership, then so much the better … for Joe Biden.