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President Trump addresses the crowd gathered at Airport High School in Cayce on Monday. Andrew J. Whitaker/Staff

President Donald Trump kept his public slams against congressman Mark Sanford going Monday night — even if he was way off in his geography. 

Trump was in South Carolina to stump for Gov. Henry McMaster but once again knocked then-Governor Sanford's 2009 extramarital affair, an incident forever tied to Sanford's lie that he was "hiking the Appalachian Trail' when he was on a trip to Argentina to see his mistress.

But the president got the reference wrong, bigly.

"The Tallahassee Trail – must be a beautiful place. Unfortunately, he didn't go there," Trump said.

The latest remarks from the president — this time in Sanford's home state — continues a public feud between the two Republicans.

Last week, Trump made fun of Sanford in a closed-door meeting with House Republicans where some members of Congress reportedly booed the president for his comments. Trump denied the reports, tweeting the following day that Republicans "applauded and laughed loudly" when he picked on Sanford.

Sanford, a longtime conservative, has repeatedly and publicly taken aim at Trump. It was a stance Sanford paid for politically when Republican Katie Arrington defeated him two weeks ago and won the GOP nomination in the state's 1st Congressional District race.

Trump on Monday told the packed crowd in Cayce why he tweeted his support for Arrington with three hours to go before polls closed that day.

"I say 'maybe I shouldn't do it because I won't have enough,' " Trump said, referring to the last-minute nature of the tweet. "What happened? I did. I can't stand that guy. I don't care. I don't care and I like her."

But even his praise for Arrington contained an error when he said her loyalty to the Trump campaign was "with us right from the beginning."

Arrington initially supported Florida Sen. Marco Rubio in the 2016 GOP presidential primary. She later backed Trump after Rubio left the race.

The presidential jabs were sandwiched between Trump's words of concern for Arrington, who suffered severe and traumatic injuries after she and a friend were in a car crash Friday night

"Let's all take a moment to send our love to Katie Arrington, who was badly hurt in a terrible car accident," Trump said. "Katie, we're all pulling for you and we're praying for your very swift recovery." 

Arrington's doctors on Monday said she is expected to make a quick recovery following a series of successful surgeries over the weekend.

"Some people say I have the greatest political instinct in 50 years," Trump later said.

Reach Caitlin Byrd at 843-937-5590 and follow her on Twitter @MaryCaitlinByrd.

Caitlin Byrd is a political reporter at The Post and Courier and author of the Palmetto Politics newsletter. Before moving to Charleston in 2016, her byline appeared in the Asheville Citizen-Times. To date, Byrd has won 17 awards for her work.