Donald Trump suggested Saturday night that President Joe Biden should “take a cognitive test,” only to get confusing in the next sentence about who gave him that test.

The former president and presumptive Republican nominee referred to Texas Republican Rep. Ronny Jackson, who was the White House physician during his presidency, as “Ronny Johnson.” The moment came as Trump was questioning Biden’s mental acuity, something he often does during the campaign and on social media.

“He doesn’t even know what the word ‘inflation’ means,” the former president said of Biden during a speech at a Turning Point Action conference in Detroit. “I think he should take a cognitive test like me.”

A few seconds later he said, “Doctor Ronny Johnson. Does everybody know Ronny Johnson, the congressman from Texas? He was the White House doctor, and he said I was the healthiest president in history, he thought, so I liked him very much right away.”

Jackson was elected to Congress in 2021 and is one of Trump’s most vocal defenders on Capitol Hill.

Trump, who turns 78 on Friday, has made it a central point of his campaign to question the 81-year-old Biden’s willingness to run for a second term. But online critics quickly capitalized on his Saturday night gaffe, with the Biden campaign — which has long grappled with criticism about the Democratic president’s verbal gaffes — posting a clip of the moment just minutes later.

Jackson told reporters at the time that Trump took a cognitive test at his own request in 2018. The test is designed to detect early signs of memory loss and other mild cognitive impairments.

The Montreal cognitive assessment taken by Trump involved memorizing a list of spoken words; listening to a list of random numbers and repeating them backwards; naming as many words beginning with the letter F as possible within, say, one minute; accurately drawing a cube; and describing concrete ways that two objects — such as a train and a bicycle — are alike.

Trump later said he had to memorize and accurately recite a list of words in order: “Person. Woman. Man. Camera. TV.”

During the same speech in Detroit, Trump also referred to a video clip widely circulated online in Republican circles, in which Biden is seen watching skydivers descending with flags from various countries during the recently concluded Group of Seven summit in Italy.

A cut-off version of the video shows Biden turning away from the leaders, turning his back and walking in another direction. He gives a thumbs-up, but it is unclear who he is pointing at. However, a more complete angle of the same scene shows the president turned to face a skydiver who has landed.

Yet Trump resorted to video clips to falsely state that Biden had turned “to look at the trees,” prompting laughter and boos from the crowd.

The Biden campaign issued a statement dismissing the clip as deceptively cropped and accusing those circulating it of “manipulating the video to fabricate falsehoods.”