President Biden and Donald Trump are set to hold their first debate, after Trump and his allies spent weeks mocking Biden’s age with doctored videos and dumb jokes about Biden’s supposed plan to rely on performance-enhancing drugs. Is all that agitprop just chum for the MAGA masses, or does it reflect a genuine belief that Biden actually is so deep into his dotage that he can’t possibly be a worthy debate adversary? We talked to veteran reporter Marc Caputo of The Bulwark, who has a good new report on Trump’s debate prep. Caputo is highly illuminating on what the Trump brain trust is really thinking as we head into the first showdown.  Learn more about your ad choices. Visit megaphone.fm/adchoices