I think Trump would do well for Biden to continue to dig his own political grave. Maybe make a quick comment on the subject, then let it go for the time being. It can always be brought up later in the election cycle.
“When your enemy is making a mistake, don’t interrupt him.”
He should outline what he’s done for jobs, anti-Clinton sentencing reform, covid-19 in minority sectors, administration hiring, The Wall, Yadda Yadda.