The traditional White House telephone tracking on Santa’s Christmas Eve travels via NORAD resulted today in a bit of trolling by an unknown participant.

A father, identified only as Jared from Oregon, wished a Merry Christmas to Biden and wife Jill on the call, then added a cheerful, “Let’s go, Brandon.” The phrase has gained currency among the president’s opponents as a substitute for a more vulgar remark.

The NORAD call started normally. The father told the president his two-year-old daughter Penelope would be happy with any presents from Santa. The president urged the family’s children to go to bed by 9 PM,

That’s when things took a turn.

“Merry Christmas and ‘Let’s go, Brandon,’” the father said in his sign-off.

After a beat, Biden said, “Let’s go Brandon, I agree.” Wife Jill winced and looked a tad chagrined, but the president didn’t seem to mind.

Santa could not be reached for comment.