Trump should taunt the DNC into NOT replacing her. Dare them. Put them into a corner. Accuse them of ‘rolling the dice’ on her. Heard the term on Rush.
The rumors are enough to destroy the dems along with the speculation on replacing her.
There is no way they can replace her, the dem message boards are already fighting over who should be the replacement with the Bernie voters already pissed they are talking Biden. It is going to be WWIII in their base with a lot of anger already stirring if they do not shut this down quickly.