(CNN) Michigan Attorney General Bill Schuette, the Republican nominee for governor, said Thursday that he regrets his behavior in a video from 1989 that appears to show him trying to flirt with a woman off camera as she sets up for an interview.

Schuette's campaign said he did not know the source of the clip or "recall the apparent interview." Schuette, who is running against Democrat Gretchen Whitmer to succeed GOP Gov. Rick Snyder, was apologetic in a statement.

"That apparently was my poor attempt to be humorous 30 years ago," he said. "The video, which appears to be edited with only one short portion shown, has been in the public domain for some time. It's fortunate for me that (his wife) Cynthia came into my life and let me know that I am not a very funny guy, but this is no less embarrassing to me today and I regret it."

The clip, which was circulated on Twitter by the pro-Democratic opposition research group American Bridge, shows Schuette speaking to a mostly unseen woman attempting to produce a television interview.

We obtained this footage of @SchuetteOnDuty, dated from 1989. It seems... interesting. Can anyone give us more information about this video and who the woman is behind the camera? #migov pic.twitter.com/1ErYoodZZV — American Bridge (@American_Bridge) October 11, 2018

When she asks if Schuette would "please move closer" to a lamp to his right, he looks directly at her and says, "I would be happy to move closer to the lamp."

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