A whataboutism that is illustrative to the topic is a perfectly appropriate reply.
So you say.
@Teflon Don is pushing a position that this is now justified because of what he perceives as unjust investigations in to Trump by his own DoJ in his first term and the Biden DoJ after.
Two wrongs don't make a right, do they?
If we accept that position then all the investigations into Trump were justified by the non stop investigations of Bill Clinton, Hillary Clinton and Obama and thus Teflon Don's entire complaint goes away.
I don't accept that position, so your premise has been gutted.
You only make that case by pointing 'whatabout' was done to them.
I haven't attempted to "make that case". But Y O U have.
Haven't you?