I think it is less about getting dirt on Biden because I dont think he will be the canidate - I think it was about finding out where the multiyear million dollar BS Russia investigation started. If that falls on Obama and Biden, let the chips fall where they may.
If you are not supposed to attack your political rivals etc - then what the F do you call the Russia investigation at this point? There is more then enough evidence that it was a sham, political dirt and foreign election meddling bought and paid for by DNC/Hillary/Obama and weaponsized by all "17" intelligence services and other alphabet offices.
It used to be that we had a transisition of power, when some felt that Hillary could lose they knew that they could not allow this president to move his agenda forward and crippled his administration with BS after BS attacks all relating back the "Russian" claims.
If it was OK and legal for Obama and his minions in the alpabits groups to do what they did - then why in the hell is it illegal for Trump to basically do his job and attempt to figure out who were the ones who actually put their thumbs on the 2016 election scale, even if that makes a small ripple in the 2020 election.
Do you feel that with the information that is coming out about the start of the Russia investigation that it was "normal" or "business as usual" ?? - well for Obama, IRS and his alphabet minions we have seen that it was business as normal, but that is not the way our government is supposed to operate, and if it is allowed to continue you can kiss this the rights of citizens goodbye and welcome to the United States of Venezuela.