This thought just occurred to me.

Donald J. Trump’s “threat” to introduce former President Bill Clinton’s marital infidelity has done the job already. He has made the president’s dalliances — alleged and proven — an issue in this campaign.

Thus, he has lowered the bar of standards to new and disgusting levels.

Whether he brings it up when he and Democratic nominee Hillary Rodham Clinton meet in their second joint appearance really is moot at this point. He’s done it already.

The media are talking about it. Trump, the GOP nominee, has told reporters that he is considering whether to raise the issue.

Therefore, the issue is out there. It’s on the table.

Here, though, is my question: How is this even relevant to the kind of job that Hillary Clinton would do as president?

I cannot discern any reasonable rationale for making this an issue in the 2016 presidential contest.

Then again, Donald Trump has defied reason and rationality all along the way en route to this point in the campaign.