President Donald Trump is getting heat on social media for making a claim on Tuesday about cutting drug prices that’s essentially mathematically impossible.

Trump began promisingly enough with a complaint shared by Democrats and Republicans alike: the high cost of medication, and how much more Americans pay for some medications than patients in other countries.
He promised to reduce those costs ― but to a very unlikely degree.
“We’re gonna get the drug prices down. Not 30% or 40%, which would be great. Not 50% or 60%. No, we’re gonna get them down 1,000%, 600%, 500%, 1,500%,” Trump said at a Republican dinner. “Numbers that are not even thought to be achievable.”

Several users asked Grok, the AI chatbot on X, if Trump’s numbers made sense. Grok called Trump’s claim “mathematically impossible,” “hyperbolic and not literal” and “total bullshit.”

But Trump insisted he could use “a certain talent that I have” to convince pharmaceutical companies that they have no choice but to reduce their prices.
Trump also mentioned an executive order he signed in May to invoke “most-favored nation” status in drug costs, which he says would ensure that drug companies can’t charge Americans any more than what they charge patients in other nations.
However, the details of that plan remain hazy, and at least one pharmaceutical CEO said discussions with the White House are ongoing and expected to take time.

Trump on Tuesday insisted that his order will lead to those price cuts.
“We will have reduced drug prices by 1,000%, by 1,100, 1,200, 1,300, 1,400, 700, 600,” he said. “Not 30 or 40 or 50%, but numbers the likes of which you’ve never even dreamed of before.”
This article originally appeared on HuffPost.