A Mexican governor is apologizing for slapping an assistant after a video of the incident made a splash online.

The clip shows Chiapas state Gov. Manuel Velasco striking the left cheek of an aide he identifies as Luis Humberto Morales while greeting party supporters at a public event Dec. 9.

The video has been shared widely on social media in recent days and inspired a host of memes. As of Wednesday afternoon it had been viewed more than 1.5 million times on YouTube.

The Associated Press could not immediately confirm the source of the video. But Velasco said Tuesday in another public event that he's sorry. He said he was making public the same apology he offered to Morales the day of the incident.

Velasco's office declined to comment further.