Former President Donald Trump has a proposition for President Joe Biden. “Joe should immediately take a Cognitive Test, and I will go with him, and take one also,” Trump posted Friday on Truth Social. “For the first time we’ll be a team, and do it for the good of the Country….And from now on, all Presidential candidates should be mandated to take a Cognitive Test and Aptitude Test, regardless of their age!!!” Trump posted. In a prior Truth Social post, Trump said he has “tried being as nice as possible considering that this is the man who has systematically destroyed our Country, and the man w…