President Biden undoubtedly knows that Trump’s been on the stimulant happy dust for decades, so he should call Trump’s bluff and agree to a drug test as long as Trump takes one, too.
Remember what “Apprentice” staffer Noel Casler said: the Adderall was flying out of Trump’s surgically-repaired nose.
The Trump syndicate is desperately afraid that knowledge of Trump’s addiction will become widespread. Thus its insistence that it is Biden, not Trump, who is the substance abuser.