President Donald Trump said Wednesday that his administration is building a wall in Colorado — a statement that was immediately met with jeers online, although he later tweeted that he was joking.

“Do you know why we’re going to win New Mexico? Because they want safety on their border, and they didn’t have it. And we’re building a wall on the border of New Mexico and we’re building a wall in Colorado,” the president said, drawing cheers from an oil and gas conference crowd.

“We’re building a beautiful wall, a big one that really works, that you can’t get over, you can’t get under,” Trump added, as the crowd rose to its feet in support. “And we’re building a wall in Texas. And we’re not building a wall in Kansas but they get the benefit of the walls we just mentioned.”

(Kiddingly) We’re building a Wall in Colorado”(then stated, “we’re not building a Wall in Kansas but they get the benefit of the Wall we’re building on the Border”) refered to people in the very packed auditorium, from Colorado & Kansas, getting the benefit of the Border Wall! — Donald J. Trump (@realDonaldTrump) October 24, 2019

The remark came about 40 minutes into a speech to an annual shale conference in Pittsburgh, during which the president spoke about a wide range of topics.

Colorado does not border Mexico, as Texas and New Mexico do.

In a tweet Wednesday at 10:20 p.m. Mountain Time, Trump said he was kidding and was referring to “the people in the very packed auditorium, from Colorado & Kansas, getting the benefit of the Border Wall!”

Gov. Jared Polis, the force behind the expansion of full-day kindergarten throughout Colorado this past session, was among many Democrats “correcting” Trump on Twitter: “Well this is awkward … Colorado doesn’t border Mexico. Good thing Colorado now offers free full day kindergarten so our kids can learn basic geography.”

Well this is awkward …Colorado doesn’t border Mexico. Good thing Colorado now offers free full day kindergarten so our kids can learn basic geography pic.twitter.com/bEXLDJYUku — Jared Polis (@GovofCO) October 23, 2019

Is NEW Mexico gonna pay for it? https://t.co/DoSNGfsB9C — Rep. Diana DeGette (@RepDianaDeGette) October 23, 2019