Former Vice President Joe Biden's mental health has been called into question over the course of the 2020 campaign. Many times he's physically present but it's obvious that he's struggling to find the words to say what he wants to articulate. After all, he previously thought he was running for the Senate, not the White House. He even got his wife, Dr. Jill Biden, and his sister, Valerie Biden Owens, mixed up. And then there was that time that he forgot President Barack Obama's name (despite them supposedly being best friends).

On Tuesday, the former veep had quite a few more mishaps during on-air interviews.

During an interview on CBS News, Biden was asked what made him "the best post-COVID-19 choice."

"Well, that's kind of a presumpt[ious] thing for me to say, for me to answer," he said, looking for words. "But, um, we went through, our administration, uh, the H1N1 virus. We also dealt with the whole pandemic that was in Africa. Kept it under control by, you know, doing what I urged the president to do months ago and he's doing now, getting the U.S. military in building hospitals."

That "whole pandemic that was in Africa" is known as Ebola.

It's rather amazing that he said the virus was in Africa (which it was). Wasn't he the one who said referring to the virus as the "Wuhan coronavirus" or the "Chinese virus" is racist or xenophobic?

Joe Biden forgets what “Ebola” is called, refers to it as "the whole pandemic that was in Africa” pic.twitter.com/DK4A2kOy5g — Steve Guest (@SteveGuest) April 8, 2020

Later in the interview, he was asked who he was considering to be his veep pick. He gave a rather long laugh and asked, "Are you available?"

Shows how much confidence he has in his former 2020 Democratic opponents. It's also a weird thing to say considering Sen. Amy Klobuchar (D-MN) said she folded up her campaign to join his ticket. Then there was that whole possibility of Sen. Kamala Harris (D-CA) being his running mate.

Guess he forgot their names and tried to be funny about it?

This is awkward pic.twitter.com/kN0yEaaPVQ — Elizabeth Harrington (@LizRNC) April 8, 2020

And then, during an interview with CNN's Chris Cuomo, Biden spent almost 30 seconds stammering to find his thoughts on the Wisconsin primary election, which was held today.

Joe Biden loses his train of thought several times in one sentence: "I, you know, but I think that, you know - I think if there's an election, if there was an election, if people - depending how many showed up, I think I'll have done well, but who knows" pic.twitter.com/RuUmj6yBrH — Steve Guest (@SteveGuest) April 8, 2020

The sad part is guy is leading the Democratic field. He's swept the majority of delegates across the country. This is the person roughly half the country is putting his faith in to lead the free world, our military and make economic decisions that could impact us for years to come. If that doesn't scare you, it should.