I think the Senate knows much more than they let on, but Leahy is really letting on that he knows that Mueller is busy investigating OTHER things than the Trump campaign.
Maybe Sessions is doing the "OK, if you are going to force me to say it – no one has asked me to testify. Shucks, I didn't want to say that."
when he really wanted to say that.
Perhaps
the Senate/Congress committees that know all about HRC's server, all about Uranium One, and all about the Awan scandal –
are allowing President Trump to play this as he sees fit.
It is likely that our entire government and national security regimes have had to totally rebuild the system because it has been so horribly compromised. THIS TAKES TIME. And it has to be done in a way that the minions of HRC/globalists do not again jeopardize it.