Do you want proof that Donald Trump’s presidency has lowered the bar for the behavior of our elected officials?

Try this one on for size: Former South Carolina Gov. and U.S. Rep. Mark Sanford is considering challenging the president in the 2020 Republican Party primary.

You remember Sanford. This is the guy who when he was governor of South Carolina decided to travel to Argentina to cavort with a paramour, all the while instructing his gubernatorial staff to tell the media that he was “hiking along the Appalachian Trail.” Yes, the governor ordered his staff to lie about where he was and what he was doing.

The word got out. The media found Sanford in South America where he was taking a tumble with his girlfriend. Sanford’s wife, Jennifer, divorced him. He resigned the governorship, then ran for Congress, only to lose his re-election bid in 2018.

Now he is considering whether to challenge Trump’s re-election next year. Give me a break.

I only can presume that Sanford has calculated that if Donald Trump can be nominated and then elected president — given his own sordid history of lewd and lascivious behavior — then all bets are off.

Weird.