I think this FBI “investigation” is merely about getting to 50 votes. A couple of limp-spine Republicans want a little bigger fig leaf before they can work up the nerve to vote to confirm.
There are 25 Democrat seats among the 33 Senate seats being contested in November. Keeping the Senate in session makes it harder for any of those incumbents to go home and campaign.
Tonight, President Trump will be starting a series of political rallies in states with Senate elections taking place. His first stop is Wheeling, West Virginia. Joe Manchin is probably losing his mind right now.