Something happened and no one is saying what. The Dems have been playing this Russian card for some time so what is that about? If they say that Trump or Sessions or anyone is playing footsie with the Russkies then how would they know? If they have such information, or reason for suspicion, then from where did that come?
Why must Trump explain what the Dems started? Inspiring minds want to know.
Well I think it may come down, at least in part, to the Dems doing what they always do. Make "It's the seriousness of the charge" arguements against Republicans to cover what it is they themselves are doing. But in this case, Trump didn't do what Bush and most other GOP do. He didn't 'play ball' and 'reach across the aisle'.
Since he disrupts the unity of the uniparty RINO/Dems, they set up the russia thing before he got elected and were gonna hold back with it until it was best deployed. But Trump keeps polling favorably no matter what they do. Then the Sanders wing has been fighting for control. So they went with this early, expecting Trump to cave.
Sessions followed Mitch's command and recused, but Trump isn't going to back off. Now he threatens both of the uniparty factions by calling openly for investigations.
TLDR, the dems and GOP lost control of one of their Kabuki operations against America.