“Line up all these guys and shoot them.”

A University of Kansas professor is on leave after a video emerged of him musing during a lecture on how to frame and execute men who don't want to vote for a woman president.

“That's what frustrates me. “There will be some men in our society who refuse to vote for a potential female president because they believe women are not smart enough to be president,” the unidentified lecturer complained in the clip.

“We can line up all these guys and shoot them. You clearly don’t understand how the world works.”

As he wandered around the lecture hall, the man sighed audibly, then suddenly stopped and seemed to realize that he had been caught on tape.

“Did I say that? “Scratch that from the recording, I don’t want the dean to know I said that,” he joked, although it’s not clear how sincere he was.

Footage of the moment quickly went viral and sparked widespread outrage, although the class had no audible reaction to the man's comments.

The University of Kansas said in a statement Wednesday that it was “aware” of the video and that the instructor “made an inappropriate reference to violence.”

“The instructor sincerely apologizes and deeply regrets the situation. His intention was to highlight his advocacy for women's rights and equality, and he recognizes that he has done a very poor job of doing so,” KU added.