Hillary Rodham Clinton has invited Dallas billionaire Mark Cuban to Monday night’s joint appearance with Donald J. Trump.

Is that a big deal? Apparently so.

Cuban happens to detest Trump. The feeling is mutual. Cuban is backing Clinton. Cuban is a successful businessman. He owns the Dallas Mavericks pro basketball team, which happens to make a lot of money for the in-your-face, brash, loudmouthed owner.

What was Trump’s response? He reportedly considered inviting Gennifer Flowers. You remember her, right? She had an affair with Bill Clinton before Clinton became president in 1993.

Now we hear that Flowers isn’t coming to the joint appearance Monday night after all.

Oh, but Cuban will be there. Apparently his task — such as it is — will be to get under Trump’s skin just by being there on the front row, in plain sight for Trump to see.

But you know, there’s a part of me that wishes Flowers would attend this event. I almost can hear Trump make some catty reference to the former president’s misbehavior, which would give Hillary Clinton an opening to say something like:

“Perhaps I need to remind you that my husband and I worked out our difficulties and have remained in the same marriage — to each other — that we began more than 40 years ago. We still love each other very much.

“Now, tell us about your marital record, Donald.”