Is the FBI secretly working for the Trump administration?
The other way of looking at it is:
Because the Republicans have the majority and the VP happens to have the tie breaking vote - the President and the Republicans held the strategic winning hand in this political poker game.
While the Democrats were driving to have the vote of public opinion sway and influence the norm for 'Due-Process' -
The Republicans merely agreed to a ONE WEEK FBI investigation to get the perception monkey off of their back...
This was a very clever winning strategic tactic as it enabled 3 out of the 4 critical voters to be able to reflect upon their previous deliberations as well as the limited FBI investigation as the basis for their deciding votes... The limited duration FBI investigation allowed all those who voted Yes a legitimate means to save face with their constituents...
The simple reality is that One Week provides the perception of agreeability and 'due-process'; while in reality it is completely unrealistic to expect that they could come to any other outcome in that limited amount of time - as their outcome is consistent with the FACTS that were presented during the Hearings...
Unfortunately, many people struggle to grasp the difference between availability of FACTS and 'Public Opinion'...