Hillary Clinton may not be too happy about this one.
Chelsea Clinton just made one mother of a verbal faux pas.
While rallying for her mom, Hillary Clinton, in Minnesota on Wednesday, she accidentally referred to Bernie Sanders, Hillary's Democratic rival for Commander in Chief, as "President Sanders."
WATCH: Chelsea Clinton & Ivanka Trump Are Basically Besties Despite Their Parents' Rivalry
The slipup occurred while Chelsea, 35, was speaking about Sanders' position on immunity for gun makers, an issue the Vermont senator voted in favor of.
"We also need to strip away the immunity that President Sanders... Senator Sanders, excuse me, I hope not President Sanders, voted for," she said, laughing off her flub.
WATCH: Chelsea Clinton Shares Rare Photo to Celebrate Daughter Charlotte's First Birthday
The honest mistake could’ve easily been the result of baby brain, considering the former first daughter announced on Dec. 21 that she was expecting her second child with husband Marc Mezvinsky. The pair already have a 16-month-old daughter, Charlotte.
Check out Hillary's sweet reaction after learning that she was going to be a grandma for the second time in the video below.