First, Biden should declare that he will take part in a debate only if Trump releases his tax returns for 2016 through 2018. Biden has already done so, and they are on his website. Trump must, too. No more gifting Trump something he can attack while hiding his own questionable finances.
And second, Biden should insist that a real-time fact-checking team approved by both candidates be hired by the nonpartisan Commission on Presidential Debates — and that 10 minutes before the scheduled conclusion of the debate this team report on any misleading statements, phony numbers or outright lies either candidate had uttered. That way no one in that massive television audience can go away easily misled.
Debates always have ground rules. Why can’t telling the truth and equal transparency on taxes be conditions for this one?