Trump challenges Biden to a cognitive test but confuses the name of the doctor who tested him

• Donald Trump called for Joe Biden to take a cognitive test but misnamed the doctor who tested him.

• Trump referred to Republican Rep. Ronny Jackson of Texas as "Doc. Ronny Johnson."

• Trump took a cognitive test in 2018, which indicated no mental-ability issues.

Donald Trump told supporters that President Joe Biden should be forced to take a cognitive test but then confused the name of the doctor who performed the test on him in 2018.

Speaking at a Turning Point Action convention in Detroit on Saturday, Trump said: "He doesn't even know what the word 'inflation' means. I think he should take a cognitive test like I did."

But a moment later, the former president referred to Republican Rep. Ronny Jackson of Texas, who was the White House physician from 2013 to 2018, as "Doc. Ronny Johnson."

"Doc. Ronny Johnson. Does everyone know Ronny Johnson, congressman from Texas? He was the White House doctor, and he said I was the healthiest president, he feels, in history, so I liked him very much indeed immediately," Trump said.

Trump took a cognitive test in 2018, after which Jackson said he spotted "no issues whatsoever" with Trump's mental ability, adding that he was "very sharp" and "articulate" and that he got a perfect score on a gold-standard dementia test.

On Friday, the Trump campaign branded Biden a "brain-dead zombie" after a video appeared to show him wandering off from leaders at the G7 summit this week.

"From Italy to the United Kingdom to New York, millions of people around the world woke up to headlines about crooked Joe Biden's cognitive decline on full display at the G7 Summit," Karoline Leavitt, Trump's spokesperson, said.

The video later turned out to be cropped, and a wider angle of the same scene showed the president had turned to face a skydiver who had just landed.

The video, shared widely across right-wing media platforms, came after the Biden campaign acknowledged Trump's 78th birthday this week with a scathing statement that included 78 things Trump did this year, including a host of felony convictions.

James Singer, a Biden campaign spokesperson, said: "Happy birthday, Donald. You're a crook, a failure, a fraud, and a threat to our democracy, economy, rights, and future."

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