Congresswoman Nancy Mace slammed cops at the Charleston International Airport last week for what she called “incompetence” … and now she’s doubling down.

It all started Thursday when the representative from South Carolina had a complete meltdown after airport cops — who were supposed to escort her from the curb to her flight gate — didn’t show up at her correct drop-off spot on time. She reportedly launched into an expletive-laced tirade in the airport as a result.

In an interview with Fox Business’ “Mornings with Maria” Monday, she cited rising political violence as a reason for her behavior, saying … “In the political environment we have today, there’s no room for error when it comes to security.”

According to a police report, Mace called the cops “f***ing incompetent,” and then said, “This is no way to treat a f***ing U.S. Representative.”

Mace went on to claim the cops would never have treated Tim Scott — the junior GOP Senator from South Carolina — the way they treated her. She continued to complain as the officers escorted her through the terminal to her gate — and even berated some TSA agents before getting on her flight, the report states.