President Trump on Saturday responded to reports that the cost of his proposed border wall is much higher than expected, insisting that it will be much cheaper after he gets involved in negotiations.

“I am reading that the great border WALL will cost more than the government originally thought, but I have not gotten involved in the … design or negotiations yet. When I do, just like with the F-35 FighterJet or the Air Force One Program, price will come WAY DOWN!” Trump wrote in a series of tweets.

I am reading that the great border WALL will cost more than the government originally thought, but I have not gotten involved in the..... — Donald J. Trump (@realDonaldTrump) February 11, 2017

...design or negotiations yet. When I do, just like with the F-35 FighterJet or the Air Force One Program, price will come WAY DOWN! — Donald J. Trump (@realDonaldTrump) February 11, 2017

Reuters on Thursday reported that the planned wall along the U.S.-Mexico border would cost as much as $21.6 billion — nearly double the $12 billion price tag that Trump has claimed in the past.

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The wall would actually be a series of fences and walls covering more than 1,250 miles by the end of 2020, the report said, citing internal Homeland Security Department figures.

Trump made his border wall proposal a lynchpin of his campaign, promising that Mexico will pay for it. Mexican leaders have repeatedly said they refuse to.