Colorado's governor mocked President Donald Trump for his comment that he was building his US-Mexico border wall in the state.

Gov. Jared Polis, a Democrat, pointed out that Colorado didn't border Mexico and said: "Good thing Colorado now offers free full day kindergarten so our kids can learn basic geography."

Other politicians also mocked Trump. John Hickenlooper, the former Colorado governor who ended his 2020 presidential bid in August, pointed out that the state shared a border with the US state of New Mexico — not the country of Mexico.

Trump said on Twitter that he had mentioned a border wall in Colorado "kiddingly" and was talking about people in Colorado "getting the benefit of the Border Wall!"

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Colorado's governor mocked President Donald Trump for saying he was building the US-Mexico border wall in the state, suggesting that he needed "basic geography" lessons like a kindergartner.

Trump said in a speech in Pittsburgh on Wednesday that the US was "building a wall in Colorado."

"And we're building a wall on the border of New Mexico," he said. "And we're building a wall in Colorado. We're building a beautiful wall. A big one that really works — that you can't get over, you can't get under."

Gov. Jared Polis, a Democrat, pointed out on Facebook that Colorado did not share a border with Mexico.

"Well this is awkward...Colorado doesn't border Mexico," he wrote.

Read more: An 8-year-old girl climbed an 18-foot replica of Trump's 'un-climbable' border wall in seconds

"Good thing Colorado now offers free full day kindergarten so our kids can learn basic geography," he said.

Other politicians including John Hickenlooper, the former Colorado governor who ended his 2020 presidential bid in August, also mocked Trump's statement.

Hickenlooper tagged Sens. Martin Heinrich and Tom Udall of New Mexico in a tweet, pointing out that Colorado shared a border with the US state of New Mexico — and not the country of Mexico.

"Hey @TeamHeinrich & @tomudall do one of you want to break it to @realDonaldTrump that Colorado's border is with New Mexico, not Mexico...or should I?" he wrote.

On Thursday morning, Trump tweeted that he had mentioned a border wall in Colorado "kiddingly" and was referring "to people in the very packed auditorium, from Colorado & Kansas, getting the benefit of the Border Wall!"

A border wall between the US and Mexico was a major campaign promise from Trump in the run-up to his election in 2016.

Read more: Trump reportedly suggested shooting migrants in the legs and filling a moat with snakes or alligators to fortify the border wall

But while Trump has repeatedly claimed that construction is underway, no new sections of border wall have been built since he took office. Instead, existing barrier fencing has been replaced and repaired.

Trump has faced roadblocks from Democrats who oppose the wall and from private citizens who own the land he wants to build on.

Some states have sued Trump over his efforts to build the wall, including a coalition of 16 states that oppose his efforts to build the wall without approval from Congress. Trump is instead taking money from other projects, including military projects.