Trump already filed a lawsuit to stop counting in MI, which seems silly, since Biden is ahead. Eric Trump is claiming victory in PA for.... reasons. USPS officials are being called before the court in Georgia to explain why they didn't do the court ordered sweep for 300,000 missing ballots; coincidentally enough ballots to put Biden in the lead if mail-in/early voting splits hold up.
It seems that shit is only flowing downhill.
The only criticism of the Biden camp I have seen is an unsubstantiated claim that one count of ballots resulted in a 130,000 to 0 count in Biden's favor.