The Biden story is bound to arise if he should be the Democratic Party candidate for 2020 and the latest rumpus is possibly an attempt to -
* get the issue off the table in the main election next year and clear his name so as to do away with allegations against him;
* create sympathy for him being "irregularly" pursuited by the Republicans; and
* eliminate the involvement of Ukraine in the Russian Hoax story and taking that off the table,
It is possibly also a scheme to discredit the findings of the present investigation into the involvement of the Obama Administration in getting Trump illegally out of the way in 2016 and had been ongoing for three years since then.
Can this election strategy backfire? It certainly can especially since the present investigation is done in a secret way and controlled by the DP totally so that any input by the RP is eliminated. It is politically a long time to November 2020 and unless three RP senators turn tail there is no chance that there will be a public hearing by the Senate about the allegations.
I doubt whether the DP want the thing to go that far, They know that any public hearing will expose themselves to serious criticism of DP involvement in the process and the media would shout murder as the matter is based on false information they provide to the public continuously and if there is no hearing the RP will be attacked for stopping a public hearing by the ever-hysteric media.