There is a 99.9 % chance that all of the committees investigating Orange will delve into Trump family finances in connection with the Russia collusion. allegations. Obviously that is because of Trump and his family's financial and business connections with Russia, which Orange Jr. has openly admitted. 
As for Sessions, he must resign unless he wants to drag the American government even further into the muck, Springer-style. Especially because Orange is saying that Sessions should have made an unethical decision by not recusing himself. 
I am sure the other members of Orange's cabinet have ordered themselves some fancy telephone recording equipment and are backing-up every single email and making extra copies of every piece of correspondence with Orange since Orange, like Stalin, can turn on them just like that.