Kimmel proposed that the presidential candidates both take cognitive tests on live television.

Well stack up 1000 tests, the host detailed.

The comic continued to taunt Trump: Youve got a bigly brain.

Kimmel Dares Trump to Take a Cognitive Test Against Harris

Emily Elconin/Getty Images; Randy Holmes/ABC via Getty Images; Andrew Harnik/Getty Images

Your brain is the bigly-est.

Youve told us that so many times.

Lets see how you do.

you could charge people for it, if you want.

Make it a pay-per-view.

I will pay you $49.99.