Former White House physician Ronny Jackson said former Vice President Joe Biden might need to undergo cognitive testing in order to prove he’s mentally capable of handling the presidency.

Jackson, who is now a candidate for a U.S. House seat in Texas, made the suggestion after the Democratic candidate mistakenly said he was running for the Senate.

“Remember the cognitive test I gave @realDonaldTrump? The one he aced! Sounds like somebody else might need some testing done!! Scary!!” Jackson wrote on Twitter Tuesday. The quote tweet from Jackson included a video of Biden addressing the South Carolina Democratic Party’s First in the South Dinner.

“You’re the ones who sent Barack Obama the presidency. And I have a simple proposition here: I’m here to ask you for your help,” Biden asked of the audience. “Where I come from, you don’t get far unless you ask. My name’s Joe Biden. I’m a Democratic candidate for the United States Senate. Look me over. If you like what you see, help out. If not, vote for the other Biden. Give me a look, though, OK?”

Remember the cognitive test I gave @realDonaldTrump? The one he aced! Sounds like somebody else might need some testing done!! Scary!! https://t.co/MhantZoHIy

— Ronny Jackson (@RonnyJackson4TX) February 25, 2020

Donald Trump’s mental health has also been called into question by critics and medical experts who have not examined him.

Jackson was the White House physician from 2013-2018 under both President Barack Obama and Trump. During his final year, Jackson reported that Trump was in good physical and mental shape based on the results of his own cognitive tests.

Jackson was nominated to be the secretary of the Department of Veterans Affairs, but he withdrew from consideration after he was accused of drinking on the job, overprescribing medication, and facilitating a hostile work environment.

Jackson touted his close ties to Washington as he pitched himself to Texas voters in the 13th Congressional District at a Harley-Davidson store in Wichita Falls during a candidate forum last week.

“I just came from the White House. I’ve been working side by side with the president. I know all the Cabinet secretaries. I have their cellphones. I know the chief of staff, the national security adviser,” said Jackson, who is running for the House seat currently held by retiring GOP Rep. Mac Thornberry.

“I can pick the phone up, and I can call them,” he added. “They’re all friends of mine.”

Twitter was disgusted:

Remember you said trump was 239lbs?! That spoke volumes as to your medical credibility. #Girther

— M. Resists (@AngryFedupVtr) February 26, 2020

Weren't you drunk when you gave Trump that test?

— Scotty D (@thedoggeneral1) February 26, 2020

The test that even 3rd grader can ace!!! Have some respect for your profession. Your Dotard does not even remember names of his kids and places he visits. Just use google machine. FACTS matter even for physicians.

— Sri B (@snband4) February 26, 2020

Your cognitive test was a joke. Your examination was a lie. Trump doesn't weigh anywhere near 235 lbs. You should be ashamed of yourself.

— Member of the Riff-Raff (@putmygamefaceon) February 26, 2020

Drunk Doctor says what @RonnyJackson4TX 🙄 Sound Up🔊🔊🔊 pic.twitter.com/uTThYfFGyQ

— 🔥MYSTIC🔥🇷🇺THE KGOP GRAVEYARD🇷🇺👠💄💋🌈🥂 (@PuffDomino) February 26, 2020

Are you the same Ronny Jackson who was handing out oxy and uppers like lollipops to your medical staff? https://t.co/TBLNi42eOu

— Mark Stern (@mfstern) February 26, 2020