On the Congressional hearings the interesting thing will be the Russia ties that Trump has (yes, the "nonexistent" ones By Trump).
And anyway, there are a lot of angles to this:
Early Trump campaign adviser Carter Page, Trump's one-time campaign chairman Paul Manafort, informal adviser Roger Stone, and former national security adviser Michael Flynn all received letters from the Senate Intelligence Committee late last month asking for extensive documentation of their contacts with Russians dating back to June 2015 - the month Trump launched his campaign.
So Trump has to quickly find a lackey to head the FBI as otherwise the FBI investigation was going forward not to Trump's liking...
And might also have to do some "arrangements" in the Treasury department:
The Senate panel requested the records from the Treasury unit, known as FinCEN, late last month, sources told the newspaper. The sources didn't specify the nature of the records, but one source described the records as critical for the panel reaching a conclusion on whether there was any coordination between Trump associates and Russia during the campaign.
See
Treasury to share financial info on Trump and Russia for Senate probe: reports