On Friday afternoon, Donald Trump misspoke in a way that made many in Missouri’s two biggest cities do a double-take.

Speaking at the Project Safe Neighborhoods National Conference, about halfway through his roughly half-hour-long speech, Trump praised the crime-fighting effort “right here in St. Louis.”

While lauding James Clark of the Better Family Life Initiative, Trump said, “James and his team have successfully ended more than 50 ongoing, escalating gunbattles between rival gangs right here in St. Louis” before thanking Clark and turning to the topic of criminal rehabilitation.

The problem? He was in Kansas City at the time.

A simple slip of the tongue? Maybe.

But given the rivalry between people in the two cities, there’s no chance it would go without notice, especially because early in his speech, Trump said of Kansas City, “I’ve been here a lot over the last couple of months.”

Twitter quickly called Trump out:

Trump thinks he is in St. Louis when he is speaking in Kansas City. How could anyone expect him to understand the filings?

— Adam Parkhomenko (@AdamParkhomenko) December 8, 2018

Meanwhile, Trump addressed a crowd in Kansas City and apparently congratulated someone on the great work they are doing "right here in St. Louis."

As a lifelong Kansas Citian, please let it be known that the residents of our two cities pretty much hate each other.

— Jennifer Hayden (@Scout_Finch) December 7, 2018

Trump just commended a law enforcement agent for his work fighting "rival gangs, right here in St. Louis." Members of the audience in Kansas City did a double take.

— Annie Karni (@anniekarni) December 7, 2018

Trump just praised law enforcement fighting "rival gangs, right here in St. Louis."

He's in Kansas City.

My God, this man is a dumbass.

— Krown City King (@KrownCityKing) December 7, 2018

@realDonaldTrump here is map of missouri. you, the spawn of satan, were in kansas city today, not st. louis, as you said in your “speech.” i have circled the cities for you, in case you have trouble finding them. you are welcome. pic.twitter.com/dYXLAy2SXq

— kara (@gingerpixie333) December 7, 2018

Yes he did, it was in my home town of Kansas City, and dumbass thought he was in St. Louis, he even stated “right here in St.Louis” during his speech. Zero days without being a national embarrassment!

— Scott (@Scottybkcmo) December 8, 2018

A reminder about your visit yeterday:

When youre in #KansasCity, you're not in #StLouis. pic.twitter.com/B6hooOW4Li

— Mike Wickett (@mikewickett) December 8, 2018

This dumbass @realDonaldTrump called Kansas City, St.Louis in a national press conference.

— Tanner Keith Loveall (@daddyloveall160) December 8, 2018

WATCH:

Trump, who is speaking at a law enforcement event in Kansas City, shouts out a cop for ending "more than 50 ongoing escalating gun battles right here in St. Louis." ????‍♂️ pic.twitter.com/RFgDCt2QRE

— Aaron Rupar (@atrupar) December 7, 2018